Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atomic matter-wave revivals with definite atom number in an optical
  lattice   We study the collapse and revival of interference patterns in the momentum
distribution of atoms in optical lattices, using a projection technique to
properly account for the fixed total number of atoms in the system. We consider
the common experimental situation in which weakly interacting bosons are loaded
into a shallow lattice, which is suddenly made deep. The collapse and revival
of peaks in the momentum distribution is then driven by interactions in a
lattice with essentially no tunnelling. The projection technique allows to us
to treat inhomogeneous (trapped) systems exactly in the case that
non-interacting bosons are loaded into the system initially, and we use
time-dependent density matrix renormalization group techniques to study the
system in the case of finite tunnelling in the lattice and finite initial
interactions. For systems of more than a few sites and particles, we find good
agreement with results calculated via a naive approach, in which the state at
each lattice site is described by a coherent state in the particle occupation
number. However, for systems on the order of 10 lattice sites, we find
experimentally measurable discrepancies to the results predicted by this
standard approach.

19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs