Detection of Hole Pockets in the Candidate Type-II Weyl Semimetal MoTe2 from Shubnikov-de Haas Quantum Oscillations

Hu, Y. J.; Yu, W. C.; Lai, Kwing To; Sun, Dan; Balakirev, Fedor Fedorovich; Zhang, W.; Xie, J. Y.; Yip, K. Y.; Aulestia, E. I. Paredes; Jha, Rajveer; Higashinaka, Ryuji; Matsuda, Tatsuma D.; Yanase, Y.; Aoki, Yuji; Goh, Swee K.

doi:10.1103/PhysRevLett.124.076402

Title: Detection of Hole Pockets in the Candidate Type-II Weyl Semimetal MoTe₂ from Shubnikov-de Haas Quantum Oscillations

Journal Article · Wed Feb 19 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.076402· OSTI ID:1856164

Hu, Y. J. ^[1]; Yu, W. C. ^[1]; Lai, Kwing To ^[1]; Sun, Dan ^[2];

^[2]; Zhang, W. ^[1]; Xie, J. Y. ^[1]; Yip, K. Y. ^[1]; Aulestia, E. I. Paredes ^[1]; Jha, Rajveer ^[3]; Higashinaka, Ryuji ^[3]; Matsuda, Tatsuma D. ^[3]; Yanase, Y. ^[4]; Aoki, Yuji ^[3]; Goh, Swee K. ^[1]

Chinese University of Hong Kong (Hong Kong)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Tokyo Metropolitan Univ., (Japan)
Kyoto Univ. (Japan)

We report the bulk electronic structure of T_d-MoTe₂ features large hole Fermi pockets at the Brillouin zone center (Γ) and two electron Fermi surfaces along the Γ-X direction. However, the large hole pockets, whose existence has important implications for the Weyl physics of T_d-MoTe₂, has never been conclusively detected in quantum oscillations. This raises doubt about the realizability of Majorana states in T_d-MoTe₂, because these exotic states rely on the existence of Weyl points, which originated from the same band structure predicted by density functional theory (DFT). Here, we report an unambiguous detection of these elusive hole pockets via Shubnikov–de Haas (SdH) quantum oscillations. At ambient pressure, the quantum oscillation frequencies for these pockets are 988 and 1513 T, when the magnetic field is applied along the c axis. The quasiparticle effective masses m* associated with these frequencies are 1.50 and 2.77 m_e, respectively, indicating the importance of Coulomb interactions in this system. We further measure the SdH oscillations under pressure. At 13 kbar, we detected a peak at 1798 T with m* = 2.86 m_e . Relative to the oscillation data at a lower pressure, the amplitude of this peak experienced an enhancement, which can be attributed to the reduced curvature of the hole pockets under pressure. Combining our experimental data with DFT +U calculations, where U is the Hubbard parameter, our results shed light on why these important hole pockets have not been detected until now.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chinese University of Hong Kong (Hong Kong)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Research Grants Council of Hong Kong; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: 89233218CNA000001; DMR-1644779; CUHK 14300418; CUHK 14300117; 4053345; 4053299; 9610438; JP15H05884; JP18H04225; JP15H05745; JP18H01178; JP18H05227; JP15K05178; JP16F16028; JP19H01839

OSTI ID:: 1856164

Report Number(s):: LA-UR-21-24220; TRN: US2305137

Journal Information:: Physical Review Letters, Vol. 124, Issue 7; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Detection of Hole Pockets in the Candidate Type-II Weyl Semimetal MoTe₂ from Shubnikov-de Haas Quantum Oscillations