Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photo-enhanced excitonic correlations in a Mott insulator with nonlocal
  interactions   We investigate the effect of nonlocal interactions on the photo-doped Mott
insulating state of the two-dimensional Hubbard model using a nonequilibrium
generalization of the dynamical cluster approximation. In particular, we
compare the situation where the excitonic states are lying within the continuum
of doublon-holon excitations to a set-up where the excitons appear within the
Mott gap. In the first case, the creation of nearest-neighbor doublon-holon
pairs by excitations across the Mott gap results in enhanced excitonic
correlations, but these excitons quickly decay into uncorrelated doublons and
holons. In the second case, photo-excitation results in long-lived excitonic
states. While in a low-temperature equilibrium state, excitonic features are
usually not evident in single-particle observables such as the photoemission
spectrum, we show that the photo-excited nonequilibrium system can exhibit
in-gap states associated with the excitons. The comparison with
exact-diagonalization results for small clusters allows us to identify the
signatures of the excitons in the photo-emission spectrum.

24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph