Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gallium Arsenide Thermal Conductivity and Optical Phonon Relaxation
  Times from First-Principles Calculations   In this paper, thermal conductivity of crystalline GaAs is calculated using
first-principles lattice dynamics. The harmonic and cubic force constants are
obtained by fitting them to the force-displacement data from density functional
theory calculations. Phonon dispersion is calculated from dynamical matrix
constructed using the harmonic force constants and phonon relaxation times are
calculated using Fermi Golden rule. The calculated GaAs thermal conductivity
agrees well with experimental data. Thermal conductivity accumulations as a
function of phonon mean free path and as a function of wavelength are obtained.
Our results predict significant size effect on the GaAs thermal conductivity in
the nanoscale. Relaxation times of optical phonons and their contributions from
different scattering channels are also studied. Such information will help
understanding hot phonon effects in GaAs-based devices.

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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
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The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph