Universal Conductance Fluctuation in Two-Dimensional Topological Insulators

Universal Conductance Fluctuation in Two-Dimensional Topological Insulators

Despite considerable interest in two-dimensional (2D) topological insulators (TIs), a fundamental question still remains open how mesoscopic conductance fluctuations in 2D TIs are affected by spin-orbit interaction (SOI). Here, we investigate the effect of SOI on the universal conductance fluctuatio...

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Main Authors: Choe, Duk-Hyun, Chang, K. J.
Format: Online
Language:English
Published: Nature Publishing Group 2015
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4460725/
id pubmed-4460725
recordtype oai_dc
spelling pubmed-44607252015-06-18 Universal Conductance Fluctuation in Two-Dimensional Topological Insulators Choe, Duk-Hyun Chang, K. J. Article Despite considerable interest in two-dimensional (2D) topological insulators (TIs), a fundamental question still remains open how mesoscopic conductance fluctuations in 2D TIs are affected by spin-orbit interaction (SOI). Here, we investigate the effect of SOI on the universal conductance fluctuation (UCF) in disordered 2D TIs. Although 2D TI exhibits UCF like any metallic systems, the amplitude of these fluctuations is distinguished from that of conventional spin-orbit coupled 2D materials. Especially, in 2D systems with mirror symmetry, spin-flip scattering is forbidden even in the presence of strong intrinsic SOI, hence increasing the amplitude of the UCF by a factor of compared with extrinsic SOI that breaks mirror symmetry. We propose an easy way to experimentally observe the existence of such spin-flip scattering in 2D materials. Our findings provide a key to understanding the emergence of a new universal behavior in 2D TIs. Nature Publishing Group 2015-06-09 /pmc/articles/PMC4460725/ /pubmed/26055574 http://dx.doi.org/10.1038/srep10997 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type Open Access Journal
institution_category Foreign Institution
institution US National Center for Biotechnology Information
building NCBI PubMed
collection Online Access
language English
format Online
author Choe, Duk-Hyun
Chang, K. J.
spellingShingle Choe, Duk-Hyun
Chang, K. J.
Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
author_facet Choe, Duk-Hyun
Chang, K. J.
author_sort Choe, Duk-Hyun
title Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
title_short Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
title_full Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
title_fullStr Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
title_full_unstemmed Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
title_sort universal conductance fluctuation in two-dimensional topological insulators
description Despite considerable interest in two-dimensional (2D) topological insulators (TIs), a fundamental question still remains open how mesoscopic conductance fluctuations in 2D TIs are affected by spin-orbit interaction (SOI). Here, we investigate the effect of SOI on the universal conductance fluctuation (UCF) in disordered 2D TIs. Although 2D TI exhibits UCF like any metallic systems, the amplitude of these fluctuations is distinguished from that of conventional spin-orbit coupled 2D materials. Especially, in 2D systems with mirror symmetry, spin-flip scattering is forbidden even in the presence of strong intrinsic SOI, hence increasing the amplitude of the UCF by a factor of compared with extrinsic SOI that breaks mirror symmetry. We propose an easy way to experimentally observe the existence of such spin-flip scattering in 2D materials. Our findings provide a key to understanding the emergence of a new universal behavior in 2D TIs.
publisher Nature Publishing Group
publishDate 2015
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4460725/
_version_ 1613233433758138368

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