title: Quantum Oscillations, Thermoelectric Coefficients, and the Fermi Surface of Semimetallic WTe2.
abstract: We present a study of angle-resolved quantum oscillations of electric and thermoelectric transport coefficients in semimetallic WTe2, which has the particularity of displaying a large B(2) magnetoresistance. The Fermi surface consists of two pairs of electronlike and holelike pockets of equal volumes in a "Russian doll" structure. The carrier density, Fermi energy, mobility, and the mean-free path of the system are quantified. An additional frequency is observed above a threshold field and attributed to the magnetic breakdown across two orbits. In contrast to all other dilute metals, the Nernst signal remains linear in the magnetic field even in the high-field (ωcτ≫1) regime. Surprisingly, none of the pockets extend across the c axis of the first Brillouin zone, making the system a three-dimensional metal with moderate anisotropy in Fermi velocity, yet a large anisotropy in the mean-free path.
authors.affiliation: Wuhan National High Magnetic Field Center, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Zengwei
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: LPEM (CNRS-UPMC), ESPCI, 75005 Paris, France.
authors.forename: Xiao
authors.initials: X
authors.lastname: Lin
authors.affiliation: Wuhan National High Magnetic Field Center, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Liu
authors.affiliation: LPEM (CNRS-UPMC), ESPCI, 75005 Paris, France.
authors.forename: Benoît
authors.initials: B
authors.lastname: Fauqué
authors.affiliation: LPEM (CNRS-UPMC), ESPCI, 75005 Paris, France.
authors.forename: Qian
authors.initials: Q
authors.lastname: Tao
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Chongli
authors.initials: C
authors.lastname: Yang
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Youguo
authors.initials: Y
authors.lastname: Shi
authors.affiliation: LPEM (CNRS-UPMC), ESPCI, 75005 Paris, France.
authors.forename: Kamran
authors.initials: K
authors.lastname: Behnia