Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of sample properties on the electron velocity in quantum Hall
  bars   We report on our theoretical investigation of the effects of the confining
potential profile and sample size on the electron velocity distribution in
(narrow) quantum-Hall systems. The electrostatic properties of the electron
system are obtained by the Thomas-Fermi-Poisson nonlinear screening theory. The
electron velocity distribution as a function of the lateral coordinate is
obtained from the slope of the screened potential at the Fermi level and within
the incompressible strips (ISs). We compare our findings with the recent
experiments.

6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con