Nonlinear Ballistic Response of Quantum Spin Hall Edge States

被引：18

作者：

Bhalla, Pankaj ^{[1
,2
,3
]}

Deng, Ming-Xun ^{[4
,5
]}

Wang, Rui-Qiang ^{[4
,5
]}

Wang, Lan ^{[6
,7
]}

Culcer, Dimitrie ^{[2
,3
]}

机构：

[1] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China

[2] Univ New South Wales, ARC Ctr Excellence Future Low Energy Elect Techno, Sydney, NSW 2052, Australia

[3] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[4] Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Guangzhou 510006, Peoples R China

[5] South China Normal Univ, Guangzhou 510006, Peoples R China

[6] RMIT Univ, Sch Sci, Melbourne, Vic 3000, Australia

[7] RMIT Univ, RMIT Node, ARC Ctr Excellence Future Low Energy Elect Techno, Melbourne, Vic 3000, Australia

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 20期

基金：

澳大利亚研究理事会; 中国博士后科学基金;

关键词：

TRANSPORT; CONDUCTANCE; FORMULA; TRANSISTORS;

D O I：

10.1103/PhysRevLett.127.206801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Topological edge states (TES) exhibit dissipationless transport, yet their dispersion has never been probed. Here we show that the nonlinear electrical response of ballistic TES ascertains the presence of symmetry breaking terms, such as deviations from nonlinearity and tilted spin quantization axes. The nonlinear response stems from discontinuities in the band occupation on either side of a Zeeman gap, and its direction is set by the spin orientation with respect to the Zeeman field. We determine the edge dispersion for several classes of TES and discuss experimental measurement.

引用

页数：6

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