Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent cross-talk and parametric driving of matter-wave vortices   We show that the interaction between vortices and sound waves in atomic
Bose-Einstein condensates can be elucidated in a double-well trap: with one
vortex in each well, the sound emitted by each precessing vortex can be driven
into the opposing vortex (if of the same polarity). This cross-talk leads to a
periodic exchange of energy between the vortices which is long-range and highly
efficient. The increase in vortex energy (obtained by numerical simulations of
the Gross-Pitaevskii equation) is significant and experimentally observable as
a migration of the vortex to higher density over just a few precession periods.
Similar effects can be controllably engineered by introducing a precessing
localised obstacle into one well as an artificial generator of sound, thereby
demonstrating the parametric driving of energy into a vortex.

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The categories of this paper are: hep-ph
1
The categories of this paper are: cs
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio