Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2

Deng, Ke; Wan, Guoliang; Deng, Peng; Zhang, Kenan; Ding, Shijie; Wang, Eryin; Yan, Mingzhe; Huang, Huaqing; Zhang, Hongyun; Xu, Zhilin; Denlinger, Jonathan D.; Fedorov, A. V.; Yang, Haitao; Duan, Wenhui; Yao, Hong; Wu, Yang; Fan, Yihang; Zhang, Haijun; Chen, Xi; Zhou, Shuyun

doi:10.1038/nphys3871

Cited by 766 publications

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“…In particular, we report the emergence of well-defined quasiparticle interference patterns originating from surface arcs. Contrary to earlier studies [22]: ( spin texture which protects them from back-scattering [22,29]. Furthermore, in line with the theoretical predictions of the response of Weyl semimetals, we reveal the emergence of new quasiparticles arising at the Weyl point energy, which lift the density of states minimum associated to the Weyl node [30,31].…”

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confidence: 41%

“…1(d [20][21][22][23][24][25][26][27]; (ii) The Weyl points are expected to appear at energies above the Fermi level [15][16][17][18], where they are inaccessible to conventional photoemission techniques [20][21][22][23][24][25][26][27]. In this context, while a general consensus exists over the topological nature of the MoTe 2 arcs [20][21][22], the situation appears highly controversial for WTe 2 . Although surface arcs have clearly been observed in several photoemission studies, their topological or trivial nature is highly debated with different studies reaching conflicting conclusions [23][24][25][26].…”

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confidence: 99%

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Universal scattering response across the type-II Weyl semimetal phase diagram

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confidence: 99%

Universal scattering response across the type-II Weyl semimetal phase diagram

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“…Some experimental evidences for WTe 2 as WSM2 have been observed [5][6][7][8] . MoTe 2 is another theoretically predicted candidate of WSM2 9,10 and experimental confirmations have been reported 11,12 . The Landau level (LL) structure of type-II Weyl cone depends on the direction of the magnetic field 4,13 .…”

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confidence: 99%

Global phase diagram of disordered type-II Weyl semimetals

Liu

Jiang

et al. 2017

Phys. Rev. B

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With electron and hole pockets touching at the Weyl node, type-II Weyl semimetal is a newly proposed topological state distinct from its type-I cousin. We numerically study the localization effect for tilted type-I as well as type-II Weyl semimetals and give the global phase diagram. For disordered type-I Weyl semimetal, an intermediate three-dimensional quantum anomalous Hall phase is confirmed between Weyl semimetal phase and diffusive metal phase. However, this intermediate phase is absent for disordered type-II Weyl semimetal. Besides, near the Weyl nodes, comparing to its type-I cousin, type-II Weyl semimetal possesses even larger ratio between the transport lifetime along the direction of tilt and the quantum lifetime. Near the phase boundary between the type-I and the type-II Weyl semimetals, infinitesimal disorder will induce an insulating phase so that in this region, the concept of Weyl semimetal is meaningless for real materials.

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“…Weyl points act as a topological charges, or as either sources or sinks of Berryphase curvature pseudospin. Experimental fingerprints of WSM systems are topological Fermi arcs on the Fermi surface (FS) of the surface states [7][8][9] and unconventional magnetotransport properties due to the AdlerAbel-Jackiw anomaly [10][11][12], which corresponds to the pumping of charge carriers between Weyl points of opposite charge, or chirality, under the simultaneous presence of electric and magnetic fields [10][11][12][13][14][15][16].…”

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Fermi surface of the Weyl type-II metallic candidate WP2

et al. 2017

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Weyl type-II fermions are massless quasiparticles that obey the Weyl equation and which are predicted to occur at the boundary between electron-and hole-pockets in certain semi-metals, i.e. the (W,Mo)(Te,P)2 compounds. Here, we present a study of the Fermi-surface of WP2 via the Shubnikov-de Haas (SdH) effect. Compared to other semi-metals WP2 exhibits a very low residual resistivity, i.e. ρ0 ≃ 10 nΩcm, which leads to perhaps the largest non-saturating magneto-resistivity (ρ(H)) reported for any compound. For the samples displaying the smallest ρ0, ρ(H) is observed to increase by a factor of 2.5 × 10 7 % under µ0H = 35 T at T = 0.35 K. The angular dependence of the SdH frequencies is found to be in very good agreement with the first-principle calculations when the electron-and hole-bands are slightly shifted with respect to the Fermi level, thus supporting the existence of underlying Weyl type-II points in WP2.

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Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2

Cited by 766 publications

References 36 publications

Universal scattering response across the type-II Weyl semimetal phase diagram

Universal scattering response across the type-II Weyl semimetal phase diagram

Global phase diagram of disordered type-II Weyl semimetals

Fermi surface of the Weyl type-II metallic candidate WP2

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