Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-equilibrium variational cluster perturbation theory: quench dynamics
  of the quantum Ising model   We introduce a variational implementation of cluster perturbation theory
(CPT) to address the dynamics of spin systems driven out of equilibrium. We
benchmark the method with the quantum Ising model subject to a sudden quench of
the transverse magnetic field across the transition or within a phase. We treat
both the one-dimensional case, for which an exact solution is available, as
well the two-dimensional one, for which has to resort to numerical results.
Comparison with exact results shows that the approach provides a quite accurate
description of the real-time dynamics up to a characteristic time scale $\tau$
that increses with the size of the cluster used for CPT. In addition, and not
surprisingly $\tau$ is small for quenches across the equilibrium phase
transition, but can be quite larger for quenches within the ordered or
disordered phases.

8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
9
The categories of this paper are: nlin