Effective thermal dynamics following a quantum quench in a spin chain

Details Effective thermal dynamics following a quantum quench in a spin chain Effective thermal dynamics following a quantum quench in a spin chain

2008-10-30

arxiv.org/abs/0810.5508v2

Phys. Rev. Lett. 102, 127204 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures. Published version

Scientific paper

10.1103/PhysRevLett.102.127204

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.

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