TY - JOUR

T1 - Transport through the network of topological channels in HgTe based quantum well

AU - Gusev, G. M.

AU - Kvon, Z. D.

AU - Kozlov, D. A.

AU - Olshanetsky, E. B.

AU - Entin, M.

AU - Mikhailov, N. N.

N1 - G M Gusev acknowledges for financial support FAPESP (Brazil) and CNPq (Brazil); Z D Kvon, D A Kozlov, E B Olshanetsky, M V Entin and N N Mikhailov acknowledge for financial support Ministry of Science and Higher Education of the Russian Federation, Grant No. 075-15-2020797(13.1902.21.0024). Publisher Copyright: © 2021 IOP Publishing Ltd.

PY - 2022/1

Y1 - 2022/1

N2 - Topological insulators (TIs) represent a new quantum state of matter which is characterized by edge or surface states and an insulating band gap in the bulk. In a two-dimensional (2D) system based on the HgTe quantum well (QW) of critical width random deviations of the well width from its average value result in local crossovers from zero gap 2D Dirac fermion system to either the 2D TI or the ordinary insulator, forming a complicated in-plane network of helical channels along the zero-gap lines. We have studied experimentally the transport properties of the critical width HgTe QWs near the Dirac point, where the conductance is determined by a percolation along the zero-gap lines. The experimental results confirm the presence of percolating conducting channels of a finite width. Our work establishes the critical width HgTe QW as a promising platform for the study of the interplay between topology and localization.

AB - Topological insulators (TIs) represent a new quantum state of matter which is characterized by edge or surface states and an insulating band gap in the bulk. In a two-dimensional (2D) system based on the HgTe quantum well (QW) of critical width random deviations of the well width from its average value result in local crossovers from zero gap 2D Dirac fermion system to either the 2D TI or the ordinary insulator, forming a complicated in-plane network of helical channels along the zero-gap lines. We have studied experimentally the transport properties of the critical width HgTe QWs near the Dirac point, where the conductance is determined by a percolation along the zero-gap lines. The experimental results confirm the presence of percolating conducting channels of a finite width. Our work establishes the critical width HgTe QW as a promising platform for the study of the interplay between topology and localization.

KW - topological insulator

KW - two-dimensional systems

KW - Dirac fermions

KW - topological network

KW - GAPLESS DIRAC FERMIONS

KW - COLLOQUIUM

KW - SYSTEM

UR - http://www.scopus.com/inward/record.url?scp=85120696302&partnerID=8YFLogxK

U2 - 10.1088/2053-1583/ac351e

DO - 10.1088/2053-1583/ac351e

M3 - Article

VL - 9

JO - 2D Materials

JF - 2D Materials

SN - 2053-1583

IS - 1

M1 - 015021

ER -