Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermopower and Unconventional Nernst in the Predicted Type-II Weyl
  Semi-metal WTe$_2$   WTe$_2$ 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
semi-metallic model in which a highly compensated, high mobility metal exhibits
large magnetoresistance. Here we show that the longitudinal thermopower
(Seebeck effect) of semi-metallic WTe$_2$ 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 semi-metallic
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 WTe$_2$ in its transport properties.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex