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Article overview
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Non-equilibrium variational cluster perturbation theory: quench dynamics of the quantum Ising model | Mohammad Zhian Asadzadeh
; Michele Fabrizio
; Enrico Arrigoni
; | Date: |
2 May 2016 | Abstract: | 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 $ au$
that increses with the size of the cluster used for CPT. In addition, and not
surprisingly $ au$ is small for quenches across the equilibrium phase
transition, but can be quite larger for quenches within the ordered or
disordered phases. | Source: | arXiv, 1605.0472 | Services: | Forum | Review | PDF | Favorites |
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