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Research Article

Quasiparticle interference and impurity resonances on WTe2

Hyeokshin Kwon1,§, Taehwan Jeong2,§, Samudrala Appalakondaiah2,3,§, Youngtek Oh1, Insu Jeon1, Hongki Min4, Seongjun Park1( ), Young Jae Song2,3,5,6( ), Euyheon Hwang2,3( ), Sungwoo Hwang1
Samsung Advanced Institute of Technology, Samsung Electronics Co., Suwon 16678, Republic of Korea
SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
Department of Nano Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 16419, Republic of Korea

§ Hyeokshin Kwon, Taehwan Jeong, and Samudrala Appalakondaiah contributed equally to this work.

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Graphical Abstract

Abstract

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 WTe2 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 WTe2 single crystals. We visualize the surface states of WTe2 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.

Keywords

WTe2Weyl semimetalquasi-particle interferencescanning tunneling microscopy/spectroscopy

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Nano Research
Volume 13 Issue 9,
September 2020
Pages 2534-2540
DOI: 10.1007/s12274-020-2892-8
Cite this article:
Kwon H, Jeong T, Appalakondaiah S, et al. Quasiparticle interference and impurity resonances on WTe2. Nano Research, 2020, 13(9): 2534-2540. https://doi.org/10.1007/s12274-020-2892-8
Topics:
Crystal impuritiesScanning tunneling microscopyTemperatureTopologyTransition metals

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Received: 26 September 2019
Revised: 14 May 2020
Accepted: 21 May 2020
Published: 22 June 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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