Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macroscopic spin tunneling and quantum critical behavior of a condensate
  in double-well potential   In a previous work (PRL 87, 140405), we have shown that a spinor condensate
confined in a periodic or double-well potential exhibits ferromagnetic behavior
due to the magnetic dipole-dipole interactions between different wells, and in
the absence of external magnetic field, the ground state has a two-fold
degeneracy. In this work, we demonstrate the possibility of observing
macroscopic quantum spin tunneling between these two degenerate states and show
how the tunneling rate critically depends on the strength of the transverse
field.

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
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con