We study the nonequilibrium dynamics of the quantum Ising model following an abrupt quench of the transverse field. We focus on the on-site autocorrelation function of the order parameter, and extract the phase-coherence time tau(phi)(Q) from its asymptotic behavior. We show that the initial state determines tau(phi)(Q) only through an effective temperature set by its energy and the final Hamiltonian. Moreover, we observe that the dependence of tau(phi)(Q) on the effective temperature fairly agrees with that obtained in thermal equilibrium as a function of the equilibrium temperature.

Effective thermal dynamics following a quantum quench in a spin chain

ROSSINI, DAVIDE;
2009

Abstract

We study the nonequilibrium dynamics of the quantum Ising model following an abrupt quench of the transverse field. We focus on the on-site autocorrelation function of the order parameter, and extract the phase-coherence time tau(phi)(Q) from its asymptotic behavior. We show that the initial state determines tau(phi)(Q) only through an effective temperature set by its energy and the final Hamiltonian. Moreover, we observe that the dependence of tau(phi)(Q) on the effective temperature fairly agrees with that obtained in thermal equilibrium as a function of the equilibrium temperature.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/10418
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 179
  • ???jsp.display-item.citation.isi??? 180
social impact