Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chaotic Rydberg atoms with broken time-reversal symmetry   The dynamics of Rydberg states of atomic hydrogen perturbed simultaneously by
a static electric field and a resonant microwave field of elliptical
polarization is analysed in the quantum perturbative limit of small amplitudes.
For some configurations, the secular motion (i.e. evolution in time of the
elliptical electronic trajectory) may be classically predominantly chaotic. By
changing the orientation of the static field with respect to the polarization
of the microwave field, one can modify the global symmetries of the system and
break any generalized time-reversal invariance. This has a dramatic effect on
the statistical properties of the energy levels.

4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an