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Special Issue "Topological Quantum Materials and Applications"

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Guest Editor

Materials Genome Institute, Shanghai University, Shanghai 200444, China
Interests: topological quantum physics and materials; antiferromagnetic materials; ferromagnetism; 2D quantum materials; quantum phenomena in advanced energy materials; superconductivity and superconducting materials; spintronic devices

Prof. Dr. Yuriy Dedkov
E-Mail Website
Guest Editor

Department of Physics, Shanghai University, Shanghai 200444, China
Interests: solid state physics; photoelectron spectroscopy; low-dimensional systems; low-dimensional magnetism; graphene-based systems; transition metal di- and tri-chalcogenides

Special Issue Information

Dear Colleagues,

Topology, a mathematical concept, has recently become a popular and truly transdisciplinary topic encompassing condensed matter physics, solid state chemistry, and materials science.

Topological quantum materials are a class of compounds featuring electronic band structures, which are topologically distinct from common metals and insulators. These materials have emerged as exceptionally fertile ground for materials science research. The key ingredients for topology are certain symmetries, the inert pair effect of the outer electrons leading to inversion of the conduction and valence bands, and spin–orbit coupling.

This Special Issue of Symmetry aims to cover recent developments in these areas including, but not limited to:

design and synthesis of topological quantum materials;
the magnetic, transport, thermal properties of topological quantum materials and applications;
works related to quantum theory.

The format of welcomed articles includes full papers, communications, and reviews. Moreover, contributions should fall within the scope of the journal Symmetry.

Prof. Dr. Guixin Cao
Prof. Dr. Yuriy Dedkov
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.

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. Symmetry 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 2400 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

topological quantum physics and materials
antiferromagnetic materials
ferromagnetism
2D quantum materials
quantum phenomena in advanced energy materials
superconductivity and superconducting materials
spintronic devices

Published Papers (2 papers)

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Research

Open AccessArticle

Non-Trivial Band Topology Criteria for Magneto-Spin–Orbit Graphene

Alexander V. Eryzhenkov

Artem V. Tarasov

Alexander M. Shikin

and

Artem G. Rybkin

Symmetry 2023, 15(2), 516; https://doi.org/10.3390/sym15020516 - 15 Feb 2023

Cited by 1 | Viewed by 998

Abstract

Band structure and topology of magneto-spin–orbit graphene is investigated using the proposed tight-binding model that incorporates both Rashba and sublattice-resolved collinear exchange couplings in a generic ferrimagnetic (FIM) setting for in-plane and out-of-plane magnetization directions. The resulting band structures were analyzed for possibilities [...] Read more.

π

-state spin-splittings. It was shown that the topologically trivial in-plane FIM situation admits simple expressions for these quantities, whereas the out-of-plane FIM, which admits a nontrivial band topology, is harder to analyze. The obtained topological phase diagrams for the out-of-plane FIM case show that the anomalous Hall conductance is quite stable with respect to the antiferromagnetic (AFM) interaction, which tends to interfere with the QAHE phase; moreover, the topological phase transition has a rather smooth character with respect to the AFM coupling strength. Full article

(This article belongs to the Special Issue Topological Quantum Materials and Applications)

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Figure 1

Open AccessFeature PaperArticle

Topological Phase Transitions Driven by Sn Doping in (Mn_1−xSn_x)Bi₂Te₄

Artem V. Tarasov

Tatiana P. Makarova

Dmitry A. Estyunin

Alexander V. Eryzhenkov

Ilya I. Klimovskikh

Vladimir A. Golyashov

Konstantin A. Kokh

Oleg E. Tereshchenko

and

Alexander M. Shikin

Symmetry 2023, 15(2), 469; https://doi.org/10.3390/sym15020469 - 10 Feb 2023

Cited by 1 | Viewed by 954

Abstract

The antiferromagnetic ordering that MnBi

_{2}

_{4}

The antiferromagnetic ordering that MnBi

_{2}

_{4}

shows makes it invariant with respect to the combination of the time-reversal and primitive-lattice translation symmetries, giving rise to its topologically nontrivial nature and a number of fundamental phenomena. At the same time, the possibility to control the electronic and magnetic properties of this system can provide new effective ways for its application in devices. One of the approaches to manipulate MnBi

_{2}

_{4}

properties is the partial substitution of magnetic atoms in the compound with atoms of non-magnetic elements, which inevitably affect the interplay of magnetism and band topology in the system. In this work, we have carried out theoretical modelling of changes in the electronic structure that occur as a result of increasing the concentration of Sn atoms at Mn positions in the (Mn

_{1 - x}

_{x}

)Bi

_{2}

_{4}

compound both using Korringa–Kohn–Rostoker (KKR) Green’s function method as well as the widespread approach of using supercells with impurity in DFT methods. The calculated band structures were also compared with those experimentally measured by angle-resolved photoelectron spectroscopy (ARPES) for samples with x values of 0,

0.19

0.36

0.52

and

0.86

. We assume that the complex hybridization of Te-p

_{z}

and Bi-p

_{z}

orbitals with Sn and Mn ones leads to a non-linear dependence of band gap on Sn content in Mn positions, which is characterized by a plateau with a zero energy gap at some concentration values, suggesting possible topological phase transitions in the system. Full article

(This article belongs to the Special Issue Topological Quantum Materials and Applications)

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