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Quasiparticle interference and impurity resonances on WTe2

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Title
Quasiparticle interference and impurity resonances on WTe2
Author(s)
Hyeokshin Kwon; Taehwan Jeong; Samudrala Appalakondaiah; Youngtek Oh; Insu Jeon; Hongki Min; Seongjun Park; Young Jae Song; Euyheon Hwang; Sungwoo Hwang
Subject
WTe2, ; Weyl semimetal, ; quasi-particle interference, ; scanning tunneling microscopy, ; spectroscopy
Publication Date
2020-09
Journal
NANO RESEARCH, v.13, no.9, pp.2534 - 2540
Publisher
TSINGHUA UNIV PRESS
Abstract
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Using scanning tunneling microscopy/spectroscopy (STM/STS), we examine quasiparticle scattering and interference properties at the surface of WTe2. WTe2, layered transition metal dichalcogenide, is predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe(2)emerge as topologically protected touching points of electron and hole pockets, and Fermi arcs connecting them can be visible in the spectral function on the surface. To probe the properties of surface states, we have conducted low-temperature STM/STS (at 2.7 K) on the surfaces of WTe(2)single crystals. We visualize the surface states of WTe(2)with atomic scale resolution. Clear surface states emerging from the bulk electron pocket have been identified and their connection with the bulk electronic states shows good agreement with calculations. We show the interesting double resonance peaks in the local density of states appearing at localized impurities. The low-energy resonant peak occurs near the Weyl point above the Fermi energy and it may be mixed with the surface state of Weyl points, which makes it difficult to observe the topological nature of the Weyl semimetal WTe2
URI
https://pr.ibs.re.kr/handle/8788114/8488
DOI
10.1007/s12274-020-2892-8
ISSN
1998-0124
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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