Temperature-Induced Topological Phase Transition in HgTe Quantum Wells

被引：49

作者：

Kadykov, A. M. ^{[1
,2
]}

Krishtopenko, S. S. ^{[1
,2
]}

Jouault, B. ^{[1
]}

Desrat, W. ^{[1
]}

Knap, W. ^{[1
]}

Ruffenach, S. ^{[1
]}

Consejo, C. ^{[1
]}

Torres, J. ^{[3
]}

Morozov, S. V. ^{[2
]}

Mikhailov, N. N. ^{[4
,5
]}

Dvoretskii, S. A. ^{[4
,5
]}

Teppe, F. ^{[1
]}

机构：

[1] Univ Montpellier, CNRS, UMR 5221, Lab Charles Coulomb, F-34095 Montpellier, France

[2] RAS, Inst Phys Microstruct, GSP-105, Nizhnii Novgorod 603950, Russia

[3] Univ Montpellier, CNRS, UMR 5214, Inst Elect & Syst, F-34095 Montpellier, France

[4] Russian Acad Sci, Inst Semicond Phys, Siberian Branch, Prospekt Akad Lavrenteva 13, Novosibirsk 630090, Russia

[5] Novosibirsk State Univ, Pirogova St 2, Novosibirsk 630090, Russia

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 08期

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

CYCLOTRON-RESONANCE; STATE;

D O I：

10.1103/PhysRevLett.120.086401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a direct observation of temperature-induced topological phase transition between the trivial and topological insulator states in an HgTe quantum well. By using a gated Hall bar device, we measure and represent Landau levels in fan charts at different temperatures, and we follow the temperature evolution of a peculiar pair of "zero-mode" Landau levels, which split from the edge of electronlike and holelike subbands. Their crossing at a critical magnetic field B-c is a characteristic of inverted band structure in the quantum well. By measuring the temperature dependence of Bc, we directly extract the critical temperature T-c at which the bulk band gap vanishes and the topological phase transition occurs. Above this critical temperature, the opening of a trivial gap is clearly observed.

引用

页数：5

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