Quasiclassical approach to quantum quench dynamics in the presence of an excited-state quantum phase transition

• URL: http://arxiv.org/abs/2010.07750v2
• Date: Wed, 17 Feb 2021 15:25:43 GMT
• Title: Quasiclassical approach to quantum quench dynamics in the presence of an excited-state quantum phase transition
• Authors: Michal Kloc, Daniel \v{S}imsa, Filip Han\'ak, Petra Ruth Kapr\'alov\'a-\v{Z}\v{d}\'ansk\'a, Pavel Str\'ansk\'y, Pavel Cejnar
• Abstract summary: Recent works have shown, using exact quantum mechanical approach, that equilibration after quantum quench exhibits specific features in the presence of excited-state quantum phase transitions. We demonstrate that these features can be understood from the classical evolution of the Wigner function in phase space.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The dynamics of a quantum system following a sudden, highly non-adiabatic change of its control parameter (quantum quench) is studied with quasiclassical techniques. Recent works have shown, using exact quantum mechanical approach, that equilibration after quantum quench exhibits specific features in the presence of excited-state quantum phase transitions. In this paper, we demonstrate that these features can be understood from the classical evolution of the Wigner function in phase space.

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