Dynamics in the Ising field theory after a quantum quench

Details Dynamics in the Ising field theory after a quantum quench Dynamics in the Ising field theory after a quantum quench

2012-03-22

arxiv.org/abs/1203.5080v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We study the real-time dynamics of the order parameter $<\sigma(t)>$ in the Ising field theory after a quench in the fermion mass, which corresponds to a quench in the transverse field of the corresponding transverse field Ising chain. We focus on quenches within the ordered phase. The long-time behaviour is obtained analytically by a resummation of the leading divergent terms in a form-factor expansion for $<\sigma(t)>$. Our main result is the development of a method for treating divergences associated with working directly in the field theory limit. We recover the scaling limit of the corresponding result by Calabrese et al. [Phys. Rev. Lett. \textbf{106}, 227203 (2011)], which was obtained for the lattice model. Our formalism generalizes to integrable quantum quenches in other integrable models.

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