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 τQφ from its asymptotic behavior. We show that the initial state determines τQφ only through an effective temperature set by its energy and the final Hamiltonian. Moreover, we observe that the dependence of τQφ on the effective temperature fairly agrees with that obtained in thermal equilibrium as a function of the equilibrium temperature. © 2009 The American Physical Society.

Effective thermal dynamics following a quantum quench in a spin chain / Rossini, D.; Silva, A.; Mussardo, G.; Santoro, G. E.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 102:12(2009), pp. 127204.1-127204.4. [10.1103/PhysRevLett.102.127204]

Effective thermal dynamics following a quantum quench in a spin chain

Silva, A.;Mussardo, G.;Santoro, G. E.
2009-01-01

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 τQφ from its asymptotic behavior. We show that the initial state determines τQφ only through an effective temperature set by its energy and the final Hamiltonian. Moreover, we observe that the dependence of τQφ on the effective temperature fairly agrees with that obtained in thermal equilibrium as a function of the equilibrium temperature. © 2009 The American Physical Society.
2009
102
12
1
4
127204
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.102.127204
https://arxiv.org/abs/0810.5508
http://cdsads.u-strasbg.fr/abs/2009PhRvL.102l7204R
Rossini, D.; Silva, A.; Mussardo, G.; Santoro, G. E.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/13022
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