Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dissipative spin chains: Implementation with cold atoms and steady-state
  properties   We propose a quantum optical implementation of a class of dissipative spin
systems, including the XXZ and Ising model, with ultra-cold atoms in optical
lattices. Employing the motional degree of freedom of the atoms and detuned
Raman transitions we show how to obtain engineerable dissipation and a tunable
transversal magnetic field, enabling the study of the dynamics and
steady-states of dissipative spin models. As an example of effects made
accessible this way, we consider small spin chains and weak dissipation and
show by numerical simulation that steady-state expectation values display
pronounced peaks at certain critical system parameters. We show that this
effect is related to degeneracies in the Hamiltonian and derive a sufficient
condition for its occurrence.

2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom