Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Phase Transition in the Ground-State Phase Diagram of Binary
  Bose Gases in Optical Lattices   We investigate the ground-state phase diagram of interacting binary Bose
gases trapped in two-dimensional optical lattices by means of quantum Monte
Carlo simulations. Our simulations reveal a magnetic phase transition from a
$x-y$ ferromagnetic-order to a spin insulator inside the Mott insulating phase
with two particles per site for quasi-balanced on-site inter- and
intra-particle interactions, i.e., $U_{\uparrow \downarrow} \lesssim U$. This
3D-XY transition is characterized by the establishment of a finite local
magnetic moment along the $z$-axis, ferromagnetic correlations in the $x-y$
plan and by counterflow superfluidity inside the Mott phase. When decreasing
$U_{\uparrow \downarrow}/U$, this transition merges with the Mott-superfluid
transition and becomes first-order. The merging of the two transitions is
investigated with respect to $U_{\uparrow \downarrow}/U$ parameter.

27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
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
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics