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Title: Thermopower and unconventional Nernst effect in the predicted Type-II Weyl semimetal WTe2
Authors: Rana, K. Gaurav
Dejene, F.K.
Kumar, Neeraj
Rajamathi, Catherine R.
Sklarek, Kornelia
Felser, Claudia
Parkin, Stuart S.P.
Keywords: 2D material
Nernst effect
Thermopower
Transition metal Dichalcogenide
Weyl semimetal
Issue Date: 2018
Publisher: ACS Nanoletters
Citation: 2018. Thermopower and Unconventional Nernst Effect in the Predicted Type-II Weyl Semimetal WTe2. Nano Letters, 18(10), pp. 6591-6596.
Abstract: © 2018 American Chemical Society. WTe2 is one of a series of recently discovered high mobility semimetals, some of whose properties are characteristic of topological Dirac or Weyl metals. One of its most interesting properties is the unsaturated giant magnetoresistance that it exhibits at low temperatures. An important question is the degree to which this property can be ascribed to a conventional semimetallic model in which a highly compensated, high mobility metal exhibits large magnetoresistance. Here, we show that the longitudinal thermopower (Seebeck effect) of semimetallic WTe2 exfoliated flakes exhibits periodic sign changes about zero with increasing magnetic field that indicates distinct electron and hole Landau levels and nearly fully compensated electron and hole carrier densities. However, inconsistent with a conventional semimetallic picture, we find a rapid enhancement of the Nernst effect at low temperatures that is nonlinear in magnetic field, which is consistent with Weyl points in proximity to the Fermi energy. Hence, we demonstrate the role played by the Weyl character of WTe2 in its transport properties.
Description: This is in closed access until 21st Sept 2019.
Sponsor: We acknowledge partial support from the ERC Advanced Grant No. 670166 “SORBET” and the ERC Advanced Grant No. 742068 “TOPMAT”.
Version: Accepted for publication
DOI: 10.1021/acs.nanolett.8b03212
URI: https://dspace.lboro.ac.uk/2134/36220
Publisher Link: https://doi.org/10.1021/acs.nanolett.8b03212
ISSN: 1530-6984
Appears in Collections:Closed Access (Physics)

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