Back to Search Start Over

Non-linear ballistic response of quantum spin-Hall edge states

Authors :
Lan Wang
Ming-Xun Deng
Rui-Qiang Wang
Pankaj Bhalla
Dimitrie Culcer
Publication Year :
2021

Abstract

Topological edge states exhibit dissipationless transport and electrically-driven topological phase transitions, making them ideal for next-generation transistors that are not constrained by Moore's law. Nevertheless, their dispersion has never been probed and is often assumed to be simply linear, without any rigorous justification. Here we determine the non-linear electrical response of topological edge states in the ballistic regime and demonstrate the way this response ascertains the presence of symmetry breaking terms in the edge dispersion, such as deviations from non-linearity and tilted spin quantization axes. The non-linear 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 topological materials and discuss experimental measurement.<br />8 pages, 4 figures

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....7e55fae6a63d32df76cfb0a1a0028f0e