Monodromy in Dicke superradiance. (6th July 2017)

• Record Type: Journal Article
• Authors: Kloc, Michal; Stránský, Pavel; Cejnar, Pavel
• Is Part Of: Journal of physics. Volume 50:Number 31(2017)
• Publication Date: 2017-07-06
• Subjects: monodromy -- superradiance -- extended Dicke model; Mathematical physics -- Periodicals; Statistical physics -- Periodicals; Quantum theory -- Periodicals; Matter -- Properties -- Periodicals; 530.105
• DOI: 10.1088/1751-8121/aa7a95
• Languages: English
• ISSNs: 1751-8113

Abstract

Abstract: We study the focus–focus type of monodromy in an integrable version of the Dicke model. Classical orbits forming a pinched torus represent analogues of the dynamic superradiance under conditions of a closed system. Quantum signatures of monodromy appear in lattices of expectation values of various quantities in the Hamiltonian eigenstates and are related to an excited-state quantum phase transition. We demonstrate the breakdown of these structures with an increasing strength of non-integrable perturbation.