Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2

Nature Communications
Miguel M UgedaMichael F Crommie

Abstract

Transition metal dichalcogenide materials are unique in the wide variety of structural and electronic phases they exhibit in the two-dimensional limit. Here we show how such polymorphic flexibility can be used to achieve topological states at highly ordered phase boundaries in a new quantum spin Hall insulator (QSHI), 1T'-WSe2. We observe edge states at the crystallographically aligned interface between a quantum spin Hall insulating domain of 1T'-WSe2 and a semiconducting domain of 1H-WSe2 in contiguous single layers. The QSHI nature of single-layer 1T'-WSe2 is verified using angle-resolved photoemission spectroscopy to determine band inversion around a 120 meV energy gap, as well as scanning tunneling spectroscopy to directly image edge-state formation. Using this edge-state geometry we confirm the predicted penetration depth of one-dimensional interface states into the two-dimensional bulk of a QSHI for a well-specified crystallographic direction. These interfaces create opportunities for testing predictions of the microscopic behavior of topologically protected boundary states.

References

Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller
Apr 15, 1990·Physical Review. B, Condensed Matter·D Vanderbilt
Aug 15, 1991·Physical Review. B, Condensed Matter·X R QinJ C Irwin
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Feb 7, 2007·Physical Review Letters·Shuichi Murakami
May 17, 2007·The Review of Scientific Instruments·I HorcasA M Baro
Aug 7, 2007·Physical Review Letters·Melinda Y HanPhilip Kim
Sep 22, 2007·Science·Markus KönigShou-Cheng Zhang
Apr 7, 2010·Physical Review Letters·Victor W BrarMichael F Crommie
Sep 30, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Paolo GiannozziRenata M Wentzcovitch
Oct 27, 2011·Physical Review Letters·Ivan KnezGerard Sullivan
Oct 4, 2012·Physical Review Letters·Fang YangJin-Feng Jia
Mar 26, 2016·Science·Kurt LejaeghereStefaan Cottenier
Oct 6, 2018·Nature Communications·Ye-Heng SongShao-Chun Li

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Citations

Feb 23, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·O Ávalos-OvandoS E Ulloa
Jun 18, 2019·Chemical Communications : Chem Comm·Jessica Q GeisenhoffAlina M Schimpf
Sep 19, 2019·Nature Communications·Fei-Ting HuangSang-Wook Cheong
Apr 4, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhuojun LiShujie Tang
May 27, 2020·Chemical Society Reviews·Maria S Sokolikova, Cecilia Mattevi
Aug 17, 2020·Physical Review Letters·Chenxiao ZhaoJinfeng Jia
Apr 23, 2020·Scientific Reports·Biswapriyo DasSantanu Mahapatra
Nov 9, 2019·Physical Review Letters·H MineJ Haruyama
Mar 16, 2021·Nano Letters·Charlotte HerbigMichael F Crommie
Apr 25, 2021·Advanced Materials·Michael S LodgeBent Weber
Nov 6, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·G Tkachov
Jun 15, 2021·Chemical Science·Jiaze XieJohn S Anderson
Aug 10, 2021·The Journal of Physical Chemistry Letters·Meizhuang LiuAndrew T S Wee
Feb 6, 2020·Nano Letters·Yuki TanakaYoshihiro Iwasa
Aug 14, 2020·The Journal of Physical Chemistry Letters·Artem Pulkin, Oleg V Yazyev
Jun 20, 2020·Nano Letters·Konrád KandraiPéter Nemes-Incze
Dec 22, 2021·Chemical Society Reviews·Peter C SherrellAmanda V Ellis

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