Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Velocity dependent dislocation drag from phonon wind and crystal
  geometry   The mobility of dislocations is an important factor in understanding material
strength. Dislocations experience a drag due to their interaction with the
crystal structure, the dominating contribution at high stress and temperature
being the scattering off phonons due to phonon wind. Yet, the velocity
dependence of this effect has eluded a good theoretical understanding. In a
previous paper, dislocation drag from phonon wind as a function of velocity was
computed from first principles in the isotropic limit, in part for simplicity,
but also arguing that macroscopically, a polycrystalline metal looks isotropic.
However, since the single crystal grains are typically a few microns up to a
millimeter in size, dislocations travel in single crystals and cross
boundaries, but never actually see an isotropic material. In this work we
therefore highlight the effect of crystal anisotropy on dislocation drag by
accounting for the crystal and slip plane geometries. In particular, we keep
the phonon spectrum isotropic for simplicity, but dislocations are modeled
according to the crystal symmetry (bcc, fcc, hcp, etc.). We then compare to the
earlier purely isotropic results, as well as to experimental data and MD
simulations where they are available.

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The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an