Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation in crossed electric and magnetic fields: The quantum source
  approach   The propagation of electrons in static and uniform electromagnetic fields is
a standard topic of classical electrodynamics. The Hamilton function is given
by a quadratic polynomial in the positions and momenta. The corresponding
quantum-mechanical problem has been analyzed in great detail and the
eigenfunctions and time evolution operators are well-known. Surprisingly, the
energy-dependent counterpart of the time-evolution operator, the Green
function, is not easily accessible. However in many situations one is
interested in the evolution of a system that started with emitted particles
that carry a specific energy. In the following we present a suitable approach
to study this type of matter waves arising from a localized region in space.
Two applications are discussed, the photodetachment current in external fields
and the quantum Hall effect in a fermionic electron gas.

6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio