Dynamical Crossovers in Prethermal Critical States - Kölner UniversitätsPublikationsServer

Chiocchetta, Alessio, Gambassi, Andrea ORCID: 0000-0003-3450-6125, Diehl, Sebastian and Marino, Jamir (2017). Dynamical Crossovers in Prethermal Critical States. Phys. Rev. Lett., 118 (13). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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DOI:10.1103/PhysRevLett.118.135701

Abstract

We study the prethermal dynamics of an interacting quantum field theory with an N-component order parameter and O(N) symmetry, suddenly quenched in the vicinity of a dynamical critical point. Depending on the initial conditions, the evolution of the order parameter, and of the response and correlation functions, can exhibit a temporal crossover between universal dynamical scaling regimes governed, respectively, by a quantum and a classical prethermal fixed point, as well as a crossover from a Gaussian to a non-Gaussian prethermal dynamical scaling. Together with a recent experiment, this suggests that quenches may be used in order to explore the rich variety of dynamical critical points occurring in the nonequilibrium dynamics of a quantum many-body system. We illustrate this fact by using a combination of renormalization group techniques and a nonperturbative large-N limit.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Chiocchetta, Alessio	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Gambassi, Andrea	UNSPECIFIED	orcid.org/0000-0003-3450-6125	UNSPECIFIED
Diehl, Sebastian	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Marino, Jamir	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED