Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast Hole-Spin Dynamics in Optically Excited Bulk GaA   We present experimental and theoretical results on hole-spin dynamics in bulk
GaAs after ultrafast optical excitation. The experimental differential
transmission are compared with a dynamical calculation of the momentum-resolved
hole distributions, which includes the carrier-carrier, carrier-phonon and
carrier-impurity interaction at the level of Boltzmann scattering integrals. We
obtain good agreement with the experimentally determined hole-spin relaxation
times, but point out that depending on how the spin-polarization dynamics is
extracted, deviations from an exponential decay at short times occur. We also
study theoretically the behavior of the spin-relaxation for heavily p-doped
GaAs at low temperatures.

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The categories of this paper are: hep-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ