Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum transport equations for low-dimensional multiband electronic
  systems. I   A systematic method of calculating the dynamical conductivity tensor in a
general multiband electronic model with strong boson-mediated electron-electron
interactions is described. The theory is based on the exact semiclassical
expression for the coupling between valence electrons and electromagnetic
fields and on the self-consistent Bethe--Salpeter equations for the
electron-hole propagators. The general diagrammatic perturbation expressions
for the intraband and interband single-particle conductivity are determined.
The relations between the intraband Bethe--Salpeter equation, the quantum
transport equation and the ordinary transport equation are briefly discussed
within the memory-function approximation. The effects of the Lorentz
dipole-dipole interactions on the dynamical conductivity of low-dimensional
$sp_\alpha$ models are described in the same approximation. Such formalism
proves useful in studies of different (pseudo)gapped states of
quasi-one-dimensional systems with the metal-to-insulator phase transitions and
can be easily extended to underdoped two-dimensional high-$T_c$
superconductors.

21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs