Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Libration of strongly-oriented polar molecules inside a superfluid   We study a polar molecule immersed into a superfluid environment, such as a
helium nanodroplet or a Bose-Einstein condensate, in the presence of an intense
electrostatic field. We show that coupling of the molecular pendular motion,
induced by the field, to the fluctuating bath leads to formation of pendulons
-- spherical harmonic librators dressed by a field of many-particle
excitations. We study the behavior of the pendulon in a broad range of
molecule-bath and molecule-field interaction strengths, and reveal that its
spectrum features series of instabilities which are absent in the field-free
case of the angulon quasiparticle. Furthermore, we show that an external field
allows to finetune the positions of these instabilities in the molecular
rotational spectrum. This opens the door to detailed experimental studies of
redistribution of orbital angular momentum in many-particle systems.

11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn