Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interaction-Driven Topological Insulator in Fermionic Cold Atoms on an
  Optical Lattice: A Design with a Density Functional Formalism   We design an interaction-driven topological insulator for fermionic cold
atoms in an optical lattice, that is, we pose the question of whether we can
realize in a continuous space a spontaneous symmetry breaking induced by the
inter-atom interaction into a topological Chern insulator. Such a state,
sometimes called a "topological Mott insulator", has yet to be realized in
solid-state systems, since this requires, in the tight-binding model, large
offsite interactions on top of a small onsite interaction. Here we overcome the
difficulty by introducing a spin-dependent potential, where a spin-selective
occupation of fermions in $A$ and $B$ sublattices makes the onsite interaction
Pauli-forbidden, while a sizeable inter-site interaction is achieved by a
shallow optical potential with a large overlap between neighboring Wannier
orbitals. This puts the system away from the tight-binding model, so that we
adopt the density functional theory for cold-atoms, here extended to
accommodate non-collinear spin structures emerging in the topological regime,
to quantitatively demonstrate the phase transition to the topological Mott
insulator.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol