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Title: Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2

Abstract

Abstract Weyl semimetals display a novel topological phase of matter where the Weyl nodes emerge in pairs of opposite chirality and can be seen as either a source or a sink of Berry curvature. The exotic effects in Weyl semimetals, such as surface Fermi arcs and the chiral anomaly, make them a new playground for exploring novel functionalities. Further exploiting their potential applications requires clear understanding of their topological electronic properties. Here we report a Fourier transform scanning tunneling spectroscopy (FT-STS) study on a type-II Weyl semimetal candidate MoTe 2 whose Weyl points are predicated to be located above Fermi level. Although its electronic structure below the Fermi level has been identified by angle resolved photo emission spectroscopy, by comparing our experimental data with first-principles calculations, we are able to identify the origins of multiple scattering channels both below and above Fermi level. Our calculations also show the existence of both trivial and topological arc-like states above the Fermi energy. In the FT-STS experiments, we have observed strong signals from intra-arc scatterings as well as from the scattering between the arc-like surface states and the projected bulk states. A detailed comparison between our experimental observations and calculated results reveals themore » trivial and non-trivial scattering channels are difficult to distinguish in this compound. Interestingly, we find that the broken inversion symmetry changes the terminating states on the two inequivalent surfaces, which in turn changes the relative strength of the scattering channels observed in the FT-STS images on the two surfaces.« less

Authors:
; ORCiD logo; ; ORCiD logo; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1464574
Grant/Contract Number:  
SC0014335; SC0014208
Resource Type:
Published Article
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Name: npj Quantum Materials Journal Volume: 3 Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Iaia, Davide, Chang, Guoqing, Chang, Tay-Rong, Hu, Jin, Mao, Zhiqiang, Lin, Hsin, Yan, Shichao, and Madhavan, Vidya. Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2. United Kingdom: N. p., 2018. Web. doi:10.1038/s41535-018-0112-5.
Iaia, Davide, Chang, Guoqing, Chang, Tay-Rong, Hu, Jin, Mao, Zhiqiang, Lin, Hsin, Yan, Shichao, & Madhavan, Vidya. Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2. United Kingdom. https://doi.org/10.1038/s41535-018-0112-5
Iaia, Davide, Chang, Guoqing, Chang, Tay-Rong, Hu, Jin, Mao, Zhiqiang, Lin, Hsin, Yan, Shichao, and Madhavan, Vidya. Mon . "Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2". United Kingdom. https://doi.org/10.1038/s41535-018-0112-5.
@article{osti_1464574,
title = {Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2},
author = {Iaia, Davide and Chang, Guoqing and Chang, Tay-Rong and Hu, Jin and Mao, Zhiqiang and Lin, Hsin and Yan, Shichao and Madhavan, Vidya},
abstractNote = {Abstract Weyl semimetals display a novel topological phase of matter where the Weyl nodes emerge in pairs of opposite chirality and can be seen as either a source or a sink of Berry curvature. The exotic effects in Weyl semimetals, such as surface Fermi arcs and the chiral anomaly, make them a new playground for exploring novel functionalities. Further exploiting their potential applications requires clear understanding of their topological electronic properties. Here we report a Fourier transform scanning tunneling spectroscopy (FT-STS) study on a type-II Weyl semimetal candidate MoTe 2 whose Weyl points are predicated to be located above Fermi level. Although its electronic structure below the Fermi level has been identified by angle resolved photo emission spectroscopy, by comparing our experimental data with first-principles calculations, we are able to identify the origins of multiple scattering channels both below and above Fermi level. Our calculations also show the existence of both trivial and topological arc-like states above the Fermi energy. In the FT-STS experiments, we have observed strong signals from intra-arc scatterings as well as from the scattering between the arc-like surface states and the projected bulk states. A detailed comparison between our experimental observations and calculated results reveals the trivial and non-trivial scattering channels are difficult to distinguish in this compound. Interestingly, we find that the broken inversion symmetry changes the terminating states on the two inequivalent surfaces, which in turn changes the relative strength of the scattering channels observed in the FT-STS images on the two surfaces.},
doi = {10.1038/s41535-018-0112-5},
journal = {npj Quantum Materials},
number = 1,
volume = 3,
place = {United Kingdom},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41535-018-0112-5

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Cited by: 13 works
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