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Entropy
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Quantum Transport in Molecular Nanostructures
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Quantum Transport in Molecular Nanostructures

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Quantum Information".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 120

Special Issue Editor

Dr. Michael Ridley

E-Mail Website
Guest Editor
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
Interests: quantum foundations; molecular electronics; nonequilibrium statistical mechanics

Special Issue Information

Dear Colleagues,

The field of quantum transport in molecular nanostructures is of increasing relevance as information processing systems are implemented at the nanometer dimension. In the steady state, transport physics can encode information about electron–electron interactions, noise, and quantum interference. Meanwhile, intramolecular transport processes make the design of devices operating in the THz regime an experimental reality.

This has led to the development of a suite of techniques for the theoretical description of quantum transport in nanostructures, including, but not limited to, the nonequilibrium Green’s function (NEGF) approach, quantum Monte Carlo (QMC), and master equation approaches, which all have advantages in different transport regimes.

This Special Issue aims to bring together articles addressing energy, charge, and spin transport in molecular nanostructures, with a particular focus on time-dependent methods, strongly correlated systems, and higher-order statistics.

Dr. Michael Ridley
Guest Editor

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.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 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 transport
  • molecular junction
  • electronic correlations
  • nonequilibrium
  • Green's function
  • master equation
  • superconductivity
  • shot noise
  • full counting statistics
  • photon-assisted tunnelling
  • quantum dots

Published Papers

This special issue is now open for submission, see below for planned papers.

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Nonlinear charge transport in semiconductor superlattices and excitability.
 
Authors: Luis L. Bonilla, Manuel Carretero, Emanuel Mompó
 
Affiliations: Universidad Carlos III de Madrid, 28911 Leganés, Spain (LLB, MC), Universidad Pontificia Comillas, 28015 Madrid, Spain (EM)
 
Abstract:
Semiconductor superlattices are periodic nanaostructures consisting of epitaxially grown quantum wells and barriers. For thick barriers, the quantum wells are weakly coupled and the main transport mechanism is sequential resonant tunneling of electrons between wells. We review quantum transport in these materials and deduce the reduced balance equations for electron densities, currents and self-consistent electric field. Depending on doping density, voltage bias and other parameters, these superlattices behave as excitable systems and can respond to abrupt dc bias changes by large transients involving charge density waves before arriving at a stable stationary state. Depending on the superlattice configuration, voltage bias and temperature, the superlattices may have self-sustained oscillations of the current through them. At room temperature, they can exhibit self-sustained current oscillations due to repeated triggering and recycling of charge density waves, which can be periodic in time, quasiperiodic and chaotic. Modifying the superlattice configuration, it is possible to attain robust chaos due to wave dynamics. External noise of appropriate strength can generate self-sustained current oscillations when the superlattice is in a stable stationary state without noise, which is called coherence resonance. In turn, these oscillations can resonate with a periodic signal in the presence of sufficient noise, thereby displaying a stochastic resonance. These properties can be exploited to design and build many devices. Here, we describe detectors of weak signals by using coherence and stochastic resonance and fast generators of true random sequences useful for safe communications and storage.
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