Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature- and doping-dependent roles of valleys in thermoelectric
  performance of SnSe: a first-principles study   We theoretically investigate how each orbital and valley play a role for high
thermoelectric performance of SnSe. In the hole-doped regime, two kinds of
valence band valleys contribute to its transport properties: one is the valley
near the U-Z line, mainly consisting of the Se-$p_z$ orbitals, and the other is
the one along the $\Gamma$-Y line, mainly consisting of the Se-$p_y$ orbitals.
Whereas the former valley plays a major role in determining the transport
properties at room temperature, the latter one also offers comparable
contribution and so the band structure exhibits multi-valley character by
increasing the temperature. In the electron-doped regime, the conduction band
valley around the $\Gamma$ point solely contributes to the thermoelectric
performance, where the quasi-one-dimensional electronic structure along the
$a$-axis is crucial. This study provides an important knowledge for the
thermoelectric properties of SnSe, and will be useful for future search of
high-performance thermoelectric materials.

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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an