Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excited two-dimensional magnetopolaron states in quantum well of
  resonant tunnel junction   Tunnel spectroscopy is used to probe the electronic structure in GaAs quantum
well of resonant tunnel junction over wide range of energies and magnetic
fields normal to layers. Spin degenerated high Landau levels ($N=2\div7$) are
found to be drastically renormalised near energies when the longitudinal
optical-phonon ($\hbar\omega_{LO}$) and cyclotron energy ($\hbar\omega_{C}$)
are satisfied condition $\hbar\omega_{LO}=m\hbar\omega_{C}$, where $m=1,2,3$.
This renormalisation is attributed to formation of resonant magnetopolarons,
i.e. mixing of high index Landau levels by strong interaction of electrons at
Landau level states with LO-phonons.

28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph