Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal Conductivity of BAs under Pressure   Boron arsenide (BAs) is an ultrahigh thermal conductivity material with
special phonon-phonon scattering properties. At ambient pressure, the bunching
of acoustic phonon branches in BAs leads to a small phase-space for
three-phonon scattering. Density functional theory predicts that this acoustic
phonon bunching effect is sensitive to pressure. To explore this physics, we
measure the thermal conductivity of BAs from 0 to 25 GPa using time-domain
thermoreflectance in a diamond anvil cell. We characterized two BAs samples
with ambient thermal conductivities of 320 and 480 W m-1 K-1. Our experiments
show that the thermal conductivity of both samples depends weakly on pressure
from 0 to 25 GPa. We attribute the weak dependence of the thermal conductivity
of BAs on pressure to the weak pressure dependence of phonon-phonon scattering
rates. Our experimental results are consistent with DFT predictions that
three-phonon scattering rates increase from 0 to 25 GPa, while four-phonon
scattering rates decrease.

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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: q-fin