Observation of Topological Edge States at the Step Edges on the Surface of Type-II Weyl Semimetal TaIrTe4

ACS Nano
Xu DongYugui Yao

Abstract

Topological materials harbor topologically protected boundary states. Recently, TaIrTe4, a ternary transition-metal dichalcogenide, was identified as a type-II Weyl semimetal with the minimal nonzero number of Weyl points allowed for a time-reversal invariant Weyl semimetal. Monolayer TaIrTe4 was proposed to host topological edge states, which, however, lacks of experimental evidence. Here, we report on the topological edge states localized at the monolayer step edges of the type-II Weyl semimetal TaIrTe4 using scanning tunneling microscopy. One-dimensional electronic states that show substantial robustness against the edge irregularity are observed at the step edges. Theoretical calculations substantiate the topologically nontrivial nature of the edge states and their robustness against the edge termination and layer stacking. The observation of topological edge states at the step edges of TaIrTe4 surfaces suggests that monolayer TaIrTe4 is a two-dimensional topological insulator, providing TaIrTe4 as a promising material for topological physics and devices.

References

Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Dec 31, 2005·Physical Review Letters·C L Kane, E J Mele
Dec 16, 2006·Science·B Andrei BernevigShou-Cheng Zhang
Dec 21, 2006·The Journal of Chemical Physics·Aliaksandr V KrukauGustavo E Scuseria
Jul 18, 2009·Science·Andreas RothShou-Cheng Zhang
Sep 10, 2011·Physical Review Letters·Cheng-Cheng LiuYugui Yao
Oct 4, 2012·Physical Review Letters·Fang YangJin-Feng Jia
Oct 15, 2013·Physical Review Letters·Yong XuShou-Cheng Zhang
Apr 22, 2014·Nature Nanotechnology·Yung-Chang LinKazu Suenaga
Aug 30, 2014·Physical Review Letters·M A CazalillaF Guinea
Aug 1, 2015·Physical Review Letters·Jianwei SunJohn P Perdew
Nov 27, 2015·Nature·Alexey A SoluyanovB Andrei Bernevig
Apr 27, 2016·Advanced Materials·Feipeng ZhengJi Feng
Sep 25, 2017·Nature Communications·Lang PengYing-Shuang Fu
Oct 19, 2017·Nature Communications·Ilya BelopolskiM Zahid Hasan

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Citations

Jul 17, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xianglin PengWende Xiao
Dec 29, 2020·Journal of the American Chemical Society·Ren A WisconsXavier Roy
Oct 22, 2021·The Journal of Physical Chemistry Letters·Xianglin PengYugui Yao

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