Dynamics of symmetry breaking during quantum real-time evolution in a minimal model system
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
One necessary criterion for the thermalization of a nonequilibrium quantum many-particle system is ergodicity. It is, however, not sufficient in cases where the asymptotic long-time state lies in a symmetry-broken phase but the initial state of nonequilibrium time evolution is fully symmetric with respect to this symmetry. In equilibrium, one particular symmetry-broken state is chosen as a result of an infinitesimal symmetry-breaking perturbation. From a dynamical point of view the question is: Can such an infinitesimal perturbation be sufficient for the system to establish a nonvanishing order during quantum real-time evolution? We study this question analytically for a minimal model system that can be associated with symmetry breaking, the ferromagnetic Kondo model. We show that after a quantum quench from a completely symmetric state the system is able to break its symmetry dynamically and discuss how these features can be observed experimentally.
Details
Originalsprache | Englisch |
---|---|
Aufsatznummer | 180601 |
Fachzeitschrift | Physical review letters |
Jahrgang | 113 |
Ausgabenummer | 18 |
Publikationsstatus | Veröffentlicht - 29 Okt. 2014 |
Peer-Review-Status | Ja |