Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fine structure of phonon replicas in a tunnel spectrum of a GaAs quantum
  well   A fine structure of phonon replicas in the current-voltage characteristic of
a resonant-tunneling diode has been investigated experimentally. A detailed
study of the diode I-V curves in magnetic fields of different orientations has
allowed to determine the origin of the features in the fine structure. The
voltage positions of the features are shown to coincide with calculated that in
the frame of two models: LO-phonon assisted tunneling and resonant tunneling of
polarons.

2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat