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Condensed Matter
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Physics of Light-Matter Coupling in Nanostructures
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Physics of Light-Matter Coupling in Nanostructures

A special issue of Condensed Matter (ISSN 2410-3896).

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 27114

Special Issue Editors

Prof. Dr. Alexey Kavokin

E-Mail Website
Guest Editor
Department of Physics, School of Science, Westlake University, No.18 Shilongshan Road Cloud Town, Xihu District, Hangzhou 310024, China
Interests: excitons and exciton-polaritons; photonic crystals and metamaterials; quantum computing; spintronics; superconductivity
Dr. Helgi Sigurdsson

E-Mail Website
Guest Editor
School of Engineering and Natural Sciences, University of Iceland, Reykjavik, Iceland
Interests: polariton BEC; exciton-polariton; two-dimensional electron systems; macroscopic quantum physics; semiconductor microcavities
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is devoted to the 23rd International Conference on Physics of Light–Matter Interaction in Nanostructues (PLMCN-23). Its focus is on the fundamental and technological issues faced in the realization of a new generation of opto-electronic devices based on advanced low-dimensional and photonic structures, such as low-threshold polariton lasers, new optical switches, single-photon emitters, photonic band-gap structures, etc. This issue reviews recent achievements in the fundamental understanding of strong light–matter coupling, and follows progress in the development of epitaxial and processing technologies related to wide-gap semiconductors, organic nanostructures, and microcavities, providing the basis for advanced optical studies. Results in emerging fields such as carbon nanotubes, quantum information, and unconventional optical computing are also welcome.

Prof. Dr. Alexey Kavokin
Dr. Helgi Sigurdsson
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • quantum light–matter interaction
  • low-dimensional and photonic structures
  • polaritonics
  • optical microcavities
  • macroscopic quantum phenomena
  • opto-electronic devices
  • terahertz technologies

Published Papers (21 papers)

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Research

9 pages, 1623 KiB  
Article
Effects of the Exciton Fine Structure Splitting on the Entanglement-Based Quantum Key Distribution
by Adrián Felipe Hernández-Borda, María Paula Rojas-Sepúlveda and Hanz Yecid Ramírez-Gómez
Condens. Matter 2023, 8(4), 90; https://doi.org/10.3390/condmat8040090 - 10 Oct 2023
Viewed by 1255
Abstract
The reliable transmission of secure keys is one of the essential tasks to be efficiently accomplished by quantum information processing, and the use of entangled particles is a very important tool toward that goal. However, efficient production of maximally entangled states is still [...] Read more.
The reliable transmission of secure keys is one of the essential tasks to be efficiently accomplished by quantum information processing, and the use of entangled particles is a very important tool toward that goal. However, efficient production of maximally entangled states is still a challenge for further progress in quantum computing and quantum communication. In the search for optimal sources of entanglement, quantum dots have emerged as promising candidates, but the presence of dephasing in the generated entangled states raises questions about their real usefulness in large-scale quantum networks. In this work, we evaluate the effects of the exciton fine structure splitting, present in most quantum dot samples, on the fidelity of the BBM92 protocol for quantum key distribution. We find that the protocol’s performance is heavily impacted by such splitting and establish an upper limit for the product between the energy splitting and the exciton lifetime to have a dependable distributed key. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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12 pages, 525 KiB  
Article
Position-Dependent Effective Mass and Asymmetry Effects on the Electronic and Optical Properties of Quantum Wells with Improved Rosen–Morse Potential
by Esin Kasapoglu, Melike Behiye Yücel and Carlos A. Duque
Condens. Matter 2023, 8(4), 86; https://doi.org/10.3390/condmat8040086 - 05 Oct 2023
Cited by 2 | Viewed by 1119
Abstract
In this study, we investigated, for the first time, the effects of the spatially varying effective mass, asymmetry parameter, and well width on the electronic and optical properties of a quantum well which has an improved Rosen–Morse potential. Calculations were made within the [...] Read more.
In this study, we investigated, for the first time, the effects of the spatially varying effective mass, asymmetry parameter, and well width on the electronic and optical properties of a quantum well which has an improved Rosen–Morse potential. Calculations were made within the framework of the effective mass and parabolic band approximations. We have used the diagonalization method by choosing a wave function based on the trigonometric orthonormal functions to find eigenvalues and eigenfunctions of the electron confined within the improved Rosen–Morse potential. Our results show that the position dependence mass, asymmetry, and confinement parameters cause significant changes in the electronic and optical properties of the structure we focus on since these effects create a significant increase in electron energies and a blue shift in the absorption spectrum. The increase in energy levels enables the development of optoelectronic devices that can operate at wider wavelengths and absorb higher-energy photons. Through an appropriate choice of parameters, the Rosen–Morse potential offers, among many advantages, the possibility of simulating heterostructures close to surfaces exposed to air or vacuum, thus giving the possibility of substantially enriching the allowed optical transitions given the breaking of the system´s symmetries. Similarly, the one-dimensional Rosen–Morse potential model proposed here can be extended to one- and zero-dimensional structures such as core/shell quantum well wires and quantum dots. This offers potential advancements in fields such as optical communication, imaging technology, and solar cells. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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11 pages, 1670 KiB  
Article
Composed Effects of Electron-Hole Exchange and Near-Field Interaction in Quantum-Dot-Confined Radiative Dipoles
by Jaime David Díaz-Ramírez, Shiang-Yu Huang, Bo-Long Cheng, Ping-Yuan Lo, Shun-Jen Cheng and Hanz Yecid Ramírez-Gómez
Condens. Matter 2023, 8(3), 84; https://doi.org/10.3390/condmat8030084 - 16 Sep 2023
Cited by 1 | Viewed by 1251
Abstract
Conservation of polarization is an important requirement for reliable single-photon emitters, which, in turn, are essential building blocks for light-based quantum information processing. In this work, we study the exciton-spin dynamics in a double quantum dot under the combined effects of electron-hole exchange [...] Read more.
Conservation of polarization is an important requirement for reliable single-photon emitters, which, in turn, are essential building blocks for light-based quantum information processing. In this work, we study the exciton-spin dynamics in a double quantum dot under the combined effects of electron-hole exchange and Förster resonance energy transfer. By means of numerical solutions of the quantum master equation, we simulate the time-dependent spin polarization for two neighboring dots. According to our results, under some conditions, the depolarization caused by the electron-hole exchange may be slowed by the near field-induced interdot energy transfer, suggesting a new mechanism to extend the exciton coherence time. This opens doors to alternative schemes for improved solid-state quantum light sources. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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13 pages, 914 KiB  
Article
Elliptical Quantum Rings with Variable Heights and under Spin–Orbit Interactions
by Miguel E. Mora-Ramos, Juan A. Vinasco, A. Radu, Ricardo L. Restrepo, Alvaro L. Morales, Mehmet Sahin, Omar Mommadi, José Sierra-Ortega, Gene Elizabeth Escorcia-Salas and Carlos A. Duque
Condens. Matter 2023, 8(3), 82; https://doi.org/10.3390/condmat8030082 - 11 Sep 2023
Viewed by 1428
Abstract
We investigate the electronic properties of a semiconductor quantum ring with an elliptical shape and non-uniform height, allowing for distributed quantum-dot-like bulges along its perimeter. The adiabatic approximation and the finite element method are combined to calculate the allowed electron states in the [...] Read more.
We investigate the electronic properties of a semiconductor quantum ring with an elliptical shape and non-uniform height, allowing for distributed quantum-dot-like bulges along its perimeter. The adiabatic approximation and the finite element method are combined to calculate the allowed electron states in the structure under the effective mass approximation, considering the contributions from Rashba and Dresselahaus spin–orbit interactions and the Zeeman effect in the presence of an applied magnetic field. We discuss the features of the calculated spectra for two different ring geometries: a symmetric one with four dot-like bulges, and an asymmetric one with three hilled protuberances. The information about those states allows us to evaluate the linear optical absorption response associated with interlevel transitions between the ground and lowest excited states. This phenomenon takes place at resonant energies of only a few milielectronvolts. It is observed that spin–orbit interactions tend to quench this response under zero-field conditions in the case of symmetric confinement. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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17 pages, 3481 KiB  
Article
A DFT + U Study on the Stability of Small CuN Clusters (N = 3–6 Atoms): Calculation of Phonon Frequencies
by Luis A. Alcalá-Varilla, Rafael E. Ponnefz-Durango, Nicola Seriani, Eduard Araujo-Lopez and Javier A. Montoya
Condens. Matter 2023, 8(3), 81; https://doi.org/10.3390/condmat8030081 - 11 Sep 2023
Viewed by 1169
Abstract
Despite the interest in copper clusters, a consensus on their atomic structure is still lacking. The experimental observation of isolated clusters is difficult, and theoretical predictions vary widely. The latter is because one must adequately describe the closed shell of d electrons both [...] Read more.
Despite the interest in copper clusters, a consensus on their atomic structure is still lacking. The experimental observation of isolated clusters is difficult, and theoretical predictions vary widely. The latter is because one must adequately describe the closed shell of d electrons both in its short- and long-range effects. Herein, we investigate the stability of small copper clusters (CuN, N = 3–6 atoms) using spin-polarized DFT calculations under the GGA approximation, the Hubbard U correction, and the van der Waals forces. We found that the spin-polarized and vdW contributions have little effect on the binding energies of the isomers. The inclusion of U represents the most relevant contribution to the ordering of the CuN isomers, and our calculated binding energies for the clusters agreed with the experimental values. We also found that atomic relaxations alone are not enough to determine the stability of small copper clusters. It is also necessary to build the energy landscape or calculate the vibrational frequencies of the isomers. We found that the vibrational frequencies of the isomers were in the THz range and the normal modes of vibration were discrete. This approach is relevant to future studies involving isolated or supported copper clusters. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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14 pages, 911 KiB  
Article
Double Quantum Ring under an Intense Nonresonant Laser Field: Zeeman and Spin-Orbit Interaction Effects
by Miguel E. Mora-Ramos, Juan A. Vinasco, Adrian Radu, Ricardo L. Restrepo, Alvaro L. Morales, Mehmet Sahin, Omar Mommadi, José Sierra-Ortega, Gene Elizabeth Escorcia-Salas, Christian Heyn, Derfrey A. Duque and Carlos A. Duque
Condens. Matter 2023, 8(3), 79; https://doi.org/10.3390/condmat8030079 - 08 Sep 2023
Viewed by 1695
Abstract
We theoretically investigate the properties of an electron energy spectrum in a double GaAs-Al0.3Ga0.7As quantum ring by using the effective mass and adiabatic approximations, together with a realistic description of the confining potential profile, which is assumed to be [...] Read more.
We theoretically investigate the properties of an electron energy spectrum in a double GaAs-Al0.3Ga0.7As quantum ring by using the effective mass and adiabatic approximations, together with a realistic description of the confining potential profile, which is assumed to be deformed due to the application of an intense nonresonant laser field. The effects of the applied magnetic field and spin-orbit interaction are included. We discuss the features of the lowest confined energy levels under a variation of magnetic field strengths and intense laser parameters. The influence of this external probe on the linear optical absorption response associated with interlevel transitions is analyzed by considering both the presence and absence of spin-orbit effects. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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13 pages, 1388 KiB  
Article
Properties of Blue Phosphorene Nanoribbon-P3HT Polymer Heterostructures: DFT First Principles Calculations
by Benita Turiján-Clara, Julián D. Correa, Miguel E. Mora-Ramos and Carlos A. Duque
Condens. Matter 2023, 8(3), 74; https://doi.org/10.3390/condmat8030074 - 22 Aug 2023
Viewed by 1122
Abstract
Recently, 2D phosphorus allotropes have arisen as possible candidates for technological applications among the family of the so-called Xene layered materials. In particular, the energy band structure of blue phosphorene (BP) exhibits a medium-size semiconductor gap that tends to widen in the case [...] Read more.
Recently, 2D phosphorus allotropes have arisen as possible candidates for technological applications among the family of the so-called Xene layered materials. In particular, the energy band structure of blue phosphorene (BP) exhibits a medium-size semiconductor gap that tends to widen in the case of using this material in the form of ribbons. BP nanoribbons have attracted recent interest for their implication in the improvement in efficiency of novel solar cells. On the other hand, compound poly (3-hexylthiophene) (P3HT) is used as the semiconducting core of organic field effect transistors owing to such useful features as high carrier mobility. Here, we theoretically investigate the electronic properties of a heterostructure combination of BP—in the form of nanoribbons—with a P3HT polymer chain on top in order to identify the features of band alignment. The work is performed using first principles calculations via DFT, employing different exchange correlation approaches for comparison: PBE, HSE06 and DFT-1/2. It is found that, under DFT-1/2, such a heterostructure has a type-II band alignment. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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14 pages, 896 KiB  
Article
Electric and Magnetic Fields Effects in Vertically Coupled GaAs/AlxGa1−xAs Conical Quantum Dots
by Ana María López Aristizábal, Fernanda Mora Rey, Álvaro Luis Morales, Juan A. Vinasco and Carlos Alberto Duque
Condens. Matter 2023, 8(3), 71; https://doi.org/10.3390/condmat8030071 - 15 Aug 2023
Cited by 1 | Viewed by 1012
Abstract
Vertically coupled quantum dots have emerged as promising structures for various applications such as single photon sources, entangled quantum pairs, quantum computation, and quantum cryptography. We start with a structure composed of two vertically coupled GaAs conical quantum dots surrounded by Alx [...] Read more.
Vertically coupled quantum dots have emerged as promising structures for various applications such as single photon sources, entangled quantum pairs, quantum computation, and quantum cryptography. We start with a structure composed of two vertically coupled GaAs conical quantum dots surrounded by AlxGa1−x, and the effects of the applied electric and magnetic fields on the energies are evaluated using the finite element method. In addition, the effects are evaluated by including the presence of a shallow-donor impurity. The electron binding energy behavior is analyzed, and the effects on the photoionization cross-section are studied. Calculations are carried out in the effective mass and parabolic conduction band approximations. Our results show a notable dependence on the electric and magnetic fields applied to the photoionization cross-section. In general, it has been observed that both the electric and magnetic fields are useful parameters for inducing blueshifts of the resonant photoionization cross-section structure, which is accompanied by a drop in its magnitude. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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12 pages, 4161 KiB  
Article
ETPTA Inverse Photonic Crystals for the Detection of Alcohols
by Matin Ashurov, Stella Kutrovskaya, Alexander Baranchikov, Sergey Klimonsky and Alexey Kavokin
Condens. Matter 2023, 8(3), 68; https://doi.org/10.3390/condmat8030068 - 08 Aug 2023
Cited by 1 | Viewed by 1441
Abstract
We developed a comparatively simple and inexpensive approach for the determination of the concentration of alcohols in water. The method is based on the study of the optical properties of ethoxylate trimethylolpropane triacrylate (ETPTA) inverse photonic crystals (IPhCs). The position of the transmission [...] Read more.
We developed a comparatively simple and inexpensive approach for the determination of the concentration of alcohols in water. The method is based on the study of the optical properties of ethoxylate trimethylolpropane triacrylate (ETPTA) inverse photonic crystals (IPhCs). The position of the transmission minimum associated with the first photonic stop band (PSB) is used as the analytical signal. The PSB position depends on the swelling degree of ETPTA photoresist and the refractive index of the tested alcohols and their mixtures with water. The signal increases linearly with increasing concentration of ethylene glycol and increases nonlinearly but monotonically with the concentration of methanol and ethanol in water. Sensitivity to alcohols, in the case of the ethylene glycol–water mixtures, reached about 0.55 nm/v.% or 560 nm/RIU (refractive index unit), which is sufficient for various applications in bio/chemical detection and environmental monitoring. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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19 pages, 1308 KiB  
Article
Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots
by Rafael G. Toscano-Negrette, José C. León-González, Juan A. Vinasco, Alvaro L. Morales, Miguel E. Mora-Ramos and Carlos A. Duque
Condens. Matter 2023, 8(3), 66; https://doi.org/10.3390/condmat8030066 - 02 Aug 2023
Viewed by 1071
Abstract
A theoretical analysis was conducted to examine the electronic and optical properties of a confined electron and a hole in a type-II core-shell spherical quantum dot composed of CdSe/ZnTe and ZnTe/CdSe. The Schrödinger equation for the electron and the hole was numerically solved [...] Read more.
A theoretical analysis was conducted to examine the electronic and optical properties of a confined electron and a hole in a type-II core-shell spherical quantum dot composed of CdSe/ZnTe and ZnTe/CdSe. The Schrödinger equation for the electron and the hole was numerically solved using COMSOL-Multiphysics software in the 2D axisymmetric module, which employs the finite element method under the effective mass approximation. A Fortran code was utilized to calculate excitonic energy, specifically designed to solve the Coulomb integral. The calculations encompassed variations in the inner radius (R1), as well as variations in the electric (Fz) and magnetic (B) fields along the z-axis. The absorption coefficients were determined for transitions between the hole and electron ground states, considering z-polarized incident radiation. Including a magnetic field increases the transition energy, consequently causing the absorption peaks to shift toward the blue region of the spectrum. On the other hand, the electric field decreased the overlap of the electron and hole wavefunctions. As a result, the amplitude of the absorption peaks decreased with an increase in the electric field. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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16 pages, 2875 KiB  
Article
Nanoscale Structural Phase Transitions in Aqueous Solutions of Organic Molecules
by Nikolai Bunkin, Leonard Sabirov, Denis Semenov, Faxriddin Ismailov and Muxriddin Khasanov
Condens. Matter 2023, 8(3), 64; https://doi.org/10.3390/condmat8030064 - 26 Jul 2023
Viewed by 873
Abstract
Adiabatic compressibility βS of the 4-methylpyridine + water solution is investigated in a wide concentration and temperature variation interval using Mandelstam–Brillouin scattering spectroscopy. The adiabatic compressibility minimum caused by the microinhomogeneous structure of the solution is experimentally established at the concentration of [...] Read more.
Adiabatic compressibility βS of the 4-methylpyridine + water solution is investigated in a wide concentration and temperature variation interval using Mandelstam–Brillouin scattering spectroscopy. The adiabatic compressibility minimum caused by the microinhomogeneous structure of the solution is experimentally established at the concentration of 0.06 molar fractions of 4-methylpyridine in the solution. The results of the investigations allow the construction of a diagram of possible states caused by a continuous three-dimensional hydrogen bond network of water. The results of experimental study of the excessive hypersound absorption in acetone + water and 3-methylpyridine + water solutions are discussed based on the conclusions of the theory of high-frequency sound scattering near the critical point (developed by Chaban) and the Landau theory. These results are described within the framework of the Landau and Chaban theories and explained by the existence of two different states with minimum thermodynamic stability in the solution. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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11 pages, 621 KiB  
Article
Exploring Photonic Crystals: Band Structure and Topological Interface States
by Melquiades de Dios-Leyva, Andy Márquez-González and Carlos Alberto Duque
Condens. Matter 2023, 8(3), 63; https://doi.org/10.3390/condmat8030063 - 25 Jul 2023
Viewed by 953
Abstract
The physical mechanisms supporting the existence of topological interface modes in photonic structures, formed with the concatenation of two finite, N-period, one-dimensional photonic crystals, are investigated. It is shown that these mechanisms originate from a specific configuration of bands and bandgaps of [...] Read more.
The physical mechanisms supporting the existence of topological interface modes in photonic structures, formed with the concatenation of two finite, N-period, one-dimensional photonic crystals, are investigated. It is shown that these mechanisms originate from a specific configuration of bands and bandgaps of topological origin in the band structure of the concatenated structure. Our analysis reveals that the characteristics of such a configuration depend on the structural parameters, including the number, N, of unit cells, and determine the properties of the corresponding resonant transmission peak. It was shown that the width and maximum value of the transmission peaks decrease with N. These results not only provide new physical insight into the origin and nature of such modes, but also can be used to control and manipulate the transmission peak properties, such as peak values, full width at half maximum (FWHM), and Q-factor, which are of special interest in the fields of optical sensing, filters, etc. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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9 pages, 7856 KiB  
Article
The Synthesis of C70 Fullerene Nanowhiskers Using the Evaporating Drop Method
by Sagdulla A. Bakhramov, Urol K. Makhmanov and Bobirjon A. Aslonov
Condens. Matter 2023, 8(3), 62; https://doi.org/10.3390/condmat8030062 - 24 Jul 2023
Cited by 1 | Viewed by 1113
Abstract
Semiconductor nanowhiskers, particularly nanostructured whiskers based on zero-dimensional (0D) C70 fullerene, are being actively discussed due to the great potential of their application in modern electronics. For the first time, we proposed and implemented a method for the synthesis of nanostructured C [...] Read more.
Semiconductor nanowhiskers, particularly nanostructured whiskers based on zero-dimensional (0D) C70 fullerene, are being actively discussed due to the great potential of their application in modern electronics. For the first time, we proposed and implemented a method for the synthesis of nanostructured C70 fullerene whiskers based on the self-organization of C70 molecules during the thermal evaporation of C70 droplets on the substrate surface. We found that the onset of the synthesis of C70 nanowhiskers upon the evaporation of drops of a C70 solution in toluene on the substrate surface depends on the substrate temperature. We have provided experimental evidence that an increase in both the C70 concentration in the initial drop and the substrate temperature leads to an increase in the geometric dimensions of C70 nanowhiskers. The obtained results provide useful vision on the role of solute concentration and substrate temperature in the synthesis of one-dimensional materials. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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13 pages, 1599 KiB  
Article
Structural, Electronic, and Optical Properties of Wurtzite VxAl1−xN Alloys: A First-Principles Study
by Gene Elizabeth Escorcia-Salas, Diego Restrepo-Leal, Oscar Martinez-Castro, William López-Pérez and José Sierra-Ortega
Condens. Matter 2023, 8(3), 61; https://doi.org/10.3390/condmat8030061 - 19 Jul 2023
Viewed by 1127
Abstract
We present a comprehensive study on the structural, electronic, and optical properties of VxAl1−xN ternary alloys using first-principles calculations. Our investigations employ the full-potential linearized augmented-plane-wave (FP-LAPW) method within the density functional theory (DFT) framework. The [...] Read more.
We present a comprehensive study on the structural, electronic, and optical properties of VxAl1−xN ternary alloys using first-principles calculations. Our investigations employ the full-potential linearized augmented-plane-wave (FP-LAPW) method within the density functional theory (DFT) framework. The impact of varying vanadium composition (x = 0, 0.25, 0.5, 0.75, 1) on the structural, electronic, and optical characteristics of wurtzite VxAl1−xN alloys is examined in detail. Our findings reveal a distinct nonlinear relationship between the lattice constant, bulk modulus, and the concentration of vanadium (x) in the VxAl1−xN alloys. An analysis of the electronic band structures and densities of states reveals a metallic behavior in the VxAl1−xN alloys, primarily driven by the V-d states near the Fermi energy. These results shed light on the electronic properties of the alloys, contributing to a deeper understanding of their potential for various applications. Furthermore, we calculate various optical properties, including the real and imaginary dielectric functions, refractive index, energy loss spectrum, and reflectivity. The obtained optical functions provide valuable insights into the optical behavior of the VxAl1−xN alloys. The results contribute to the fundamental knowledge of these materials and their potential applications in various fields. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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19 pages, 11062 KiB  
Article
Theoretical Study of Electronic and Thermal Transport Properties through a Single-Molecule Junction of Catechol
by Erika Y. Soto-Gómez, Judith Helena Ojeda Silva, John A. Gil-Corrales, Daniel Gallego, Mikel F. Hurtado Morales, Alvaro L. Morales and Carlos A. Duque
Condens. Matter 2023, 8(3), 60; https://doi.org/10.3390/condmat8030060 - 15 Jul 2023
Cited by 1 | Viewed by 1068
Abstract
The study of molecular nanoelectronic devices has recently gained significant interest, especially their potential use as functional junctions of molecular wires. Aromatic systems with π-conjugated bonds within their chemical backbones, such as catechol, have attracted particular attention in this area. In this [...] Read more.
The study of molecular nanoelectronic devices has recently gained significant interest, especially their potential use as functional junctions of molecular wires. Aromatic systems with π-conjugated bonds within their chemical backbones, such as catechol, have attracted particular attention in this area. In this work, we focused on calculating and determining catechol’s electrical and thermal transport properties using the theoretical method of Green’s functions renormalized in a real space domain within a framework of tight-binding approximation to the first neighbors. Thus, we studied two theoretical models of catechol as a function of its geometry, obtaining striking variations in the profiles of electrical and thermal conductance, the Seebeck coefficient, and the figure of merit. The analyses of the results suggest the potential application of catechol as a likely conductive and thermoelectric molecule serving as a novel material to use in molecular electronic devices. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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21 pages, 1904 KiB  
Article
Theoretical Study of Thermoelectric Properties of a Single Molecule of Diphenyl-Ether
by Rafael G. Toscano-Negrette, José C. León-González, Juan A. Vinasco, Judith Helena Ojeda Silva, Alvaro L. Morales and Carlos A. Duque
Condens. Matter 2023, 8(3), 55; https://doi.org/10.3390/condmat8030055 - 27 Jun 2023
Viewed by 903
Abstract
Taking into consideration the research that has been conducted on the optical and electrical properties of molecular systems, especially the good thermoelectric energy conversion at a nanometric scale that such systems have presented, here we present a new alternative by using a particular [...] Read more.
Taking into consideration the research that has been conducted on the optical and electrical properties of molecular systems, especially the good thermoelectric energy conversion at a nanometric scale that such systems have presented, here we present a new alternative by using a particular diphenyl-ether molecule as a functional device. Such a molecular system is modeled as a planar segment coupled to two electrodes in the first-neighbor approximation within a tight-binding Hamiltonian. We study the electrical and thermal properties of diphenyl-ether molecules such as the electric current, electrical and thermal conductance, Seebeck coefficient, and figure of merit, in the strong and weak coupling regimes, considering different structural configurations and variations with temperature. Our results could be valuable for laboratory applications and/or verification since we characterize the diphenyl-ether molecule as a semiconductor device for different structural models. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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17 pages, 1492 KiB  
Article
Influence of a Non-Resonant Intense Laser and Structural Defect on the Electronic and Optical Properties of a GaAs Quantum Ring under Inversely Quadratic Potential
by José C. León-González, Rafael G. Toscano-Negrette, Juan A. Vinasco, Alvaro L. Morales, Miguel E. Mora-Ramos and Carlos A. Duque
Condens. Matter 2023, 8(2), 52; https://doi.org/10.3390/condmat8020052 - 15 Jun 2023
Cited by 3 | Viewed by 998
Abstract
We investigated the impact of a non-resonant intense laser, structural defects, and magnetic fields on the electronic and optical properties of a simple GaAs quantum ring under the inverse quadratic Hellmann potential, using the effective mass and parabolic band approximations. We obtained the [...] Read more.
We investigated the impact of a non-resonant intense laser, structural defects, and magnetic fields on the electronic and optical properties of a simple GaAs quantum ring under the inverse quadratic Hellmann potential, using the effective mass and parabolic band approximations. We obtained the energies and wavefunctions by solving the 2D Schrodinger’s equation using the finite-element numerical technique to analyze this. We considered circular polarization to calculate the dipole matrix elements, which were influenced by the laser field and structural defects in the system. This enabled us to study the linear absorption coefficients. Our results demonstrated that the presence of a laser field and a structural defect disrupt the axial symmetry of the problem. When only the non-resonant laser was present, a pattern of excited states appeared in pairs, which oscillated with the magnetic field. However, the amplitude of the oscillation decreased as the magnetic field strength increased, and these oscillations disappeared when the structural defect was introduced. It was also noted that the intensity and position of the linear optical absorption peaks exhibited a non-monotonic behavior with the magnetic field in the absence of a structural defect. However, this behavior changed when the structural defect was present, depending on the type of polarization (right or left circular). Finally, a clear improvement in the absorption peaks with an increase in the laser parameter is reported. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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14 pages, 3311 KiB  
Article
Tunable Photonic Band Gaps in Two-Dimensional Bravais–Moiré Photonic Crystal Composed of High-Tc Superconductors
by Hernán A. Gómez-Urrea, José G. Cardona, Miguel E. Mora-Ramos and Carlos A. Duque
Condens. Matter 2023, 8(2), 51; https://doi.org/10.3390/condmat8020051 - 02 Jun 2023
Viewed by 1245
Abstract
In this study, we perform a theoretical study of light propagation properties in two-dimensional square photonic crystals (PCs) following Bravais–Moiré (BM) patterns composed of copper oxide high-temperature superconductors (HTSCs). The BM PCs are made of cylindrical cores formed from the combination of two [...] Read more.
In this study, we perform a theoretical study of light propagation properties in two-dimensional square photonic crystals (PCs) following Bravais–Moiré (BM) patterns composed of copper oxide high-temperature superconductors (HTSCs). The BM PCs are made of cylindrical cores formed from the combination of two square Bravais lattices. The Moiré pattern forms due to a commensurable rotation of one of these lattices with respect to the other. The dielectric function of the superconducting material is modeled by the two-fluid Gorter–Casimir theory. We report on the corresponding gap, the mapping as a function of the radius of dielectric cores, as well as the dispersion relations of TM modes for BM PCs and for the waveguide system built of defect lines within such a crystal. The BM PCs were composed of copper oxide HTSCs, which exhibit large tunability in terms of temperature. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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13 pages, 12258 KiB  
Article
Narrowband Filters Designed from Hybrid One-Dimensional Periodic/Quasiperiodic Photonic Crystals with a Single Defect Layer
by Waira Murillo-García, Hernán A. Gómez-Urrea, Miguel E. Mora-Ramos and Carlos A. Duque
Condens. Matter 2023, 8(2), 50; https://doi.org/10.3390/condmat8020050 - 29 May 2023
Cited by 1 | Viewed by 1345
Abstract
We report the transmission spectra and electric field amplitudes of electromagnetic modes propagating in hybrid periodic/quasiperiodic multilayer photonic structures in one dimension (1D). We consider the case of the combination of biperiodic Bragg mirror and triperiodic Bragg mirrors with quasiregular (FB, Fibonacci) layered [...] Read more.
We report the transmission spectra and electric field amplitudes of electromagnetic modes propagating in hybrid periodic/quasiperiodic multilayer photonic structures in one dimension (1D). We consider the case of the combination of biperiodic Bragg mirror and triperiodic Bragg mirrors with quasiregular (FB, Fibonacci) layered components. The corresponding hybrid structure (HB) is formed by concatenating BM(N)-FB(M)-BM(N), where N (M) means the number of periods (sequence order) used for the Bragg mirrors (FB) structure. A single defect layer (D) is considered in the middle of two HBs (HB-D-HB). Optimizing the parameters (the order of sequence, number of Bragg mirror layers, thickness, and the refractive index of D) allows us to obtain narrowband filters. The manipulation of these parameters fixes the number of photonic band gaps as well as the position of transmission peaks. The existence of the selectively localized behavior of some optical modes in the structures is discussed. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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10 pages, 603 KiB  
Article
Optical Properties of Magnetic Monopole Excitons
by Junhui Cao and Alexey Kavokin
Condens. Matter 2023, 8(2), 43; https://doi.org/10.3390/condmat8020043 - 09 May 2023
Cited by 1 | Viewed by 1324
Abstract
Here we consider theoretically an exciton-like dipole formed by a magnetic monopole and a magnetic antimonopole. This type of quasiparticles may be formed in a magnetic counterpart of a one dimensional semiconductor crystal. We use the familiar Lorentz driven damped harmonic oscillator model [...] Read more.
Here we consider theoretically an exciton-like dipole formed by a magnetic monopole and a magnetic antimonopole. This type of quasiparticles may be formed in a magnetic counterpart of a one dimensional semiconductor crystal. We use the familiar Lorentz driven damped harmonic oscillator model to find the eigenmodes of magnetic monopole dipoles strongly coupled to light. The proposed model allows predicting optical signatures of magnetic monopole excitons in crystals. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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7 pages, 9258 KiB  
Article
Features of Light-Matter Coupling in Non-Ideal Lattice of Coupled Microcavities Containing Quantum Dots
by Vladimir V. Rumyantsev, Stanislav A. Fedorov, Konstantin V. Gumennyk and Alexey Ye. Rybalka
Condens. Matter 2023, 8(2), 41; https://doi.org/10.3390/condmat8020041 - 02 May 2023
Viewed by 1374
Abstract
In this paper, within the framework of virtual crystal approximation, the mathematical modeling of the dependence of the density of states of polariton excitations in a 1D photonic crystal—a system of pores (tunnel-coupled microresonators) containing quantum dots—on the concentration of structural defects is [...] Read more.
In this paper, within the framework of virtual crystal approximation, the mathematical modeling of the dependence of the density of states of polariton excitations in a 1D photonic crystal—a system of pores (tunnel-coupled microresonators) containing quantum dots—on the concentration of structural defects is performed. Full article
(This article belongs to the Special Issue Physics of Light-Matter Coupling in Nanostructures)
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