Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge transport in a superlattice: a numerical study using moment
  methods   A semiclassical model of charge transport in a semiconductor superlattice is
solved, using moments in the wavenumber direction and finite elements in the
spatial direction (first order). The selection of numerical methods guarantees
the conservation of current while allowing for high accuracy results. When a dc
voltage bias is held between the ends of the sample, self-sustaining
oscillations of the current through the superlattice are observed in a narrow
range of voltages. the calculated solution displayed the expected accuracy:
Spectral convergence in the number of moments used, and first-order convergence
in the number of grid-cells. This result paves the way for higher-order methods
(in the spatial direction) and the numerical solution of more complex models of
charge transport including quantum models based on the Wigner function.

24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph