Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological transitions of interacting bosons in one-dimensional
  bi-chromatic optical lattices   Ultra-cold atoms in 1D bi-chromatic lattices constitute a surprisingly simple
system for the study of topological insulators. We show that topological phase
transitions constitute a general feature of bosons in 1D bi-chromatic lattices,
and that these transitions may occur both as a function of the superlattice
strength and due to inter-site interactions. We discuss in addition the
topological character of incommensurate density wave phases in quasi-periodic
lattices.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph