Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum transport calculations for quantum cascade laser structures   We apply a quantum transport theory based on nonequilibrium Green's functions
to quantum cascade laser (QCL) structures, treating simultaneously the
transmission through the injector regions and the relaxation due to scattering
in the active region. The quantum kinetic equations are solved
self-consistently using self-energies for interface roughness and phonon
scattering processes within the self-consistent Born approximation. In this
way, we obtain the current density J, and the average electronic distribution
f(E) at a given energy E, as a function of applied bias. As a test case, we
apply the theory to a GaAs/Al_xGa_{1-x}As QCL structure reported in the
literature. The theoretical results reproduce well reported voltage-current
(V-I) measurements, and also demonstrate a population inversion at a bias that
agrees well with the range of currents and fields at which lasing is observed.

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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
16
The categories of this paper are: stat