Universität zu Köln

Lebreuilly, Jose, Chiocchetta, Alessio and Carusotto, Iacopo (2018). Pseudothermalization in driven-dissipative non-Markovian open quantum systems. Phys. Rev. A, 97 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9934

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Abstract

We investigate a pseudothermalization effect, where an open quantum system coupled to a nonequilibrated environment consisting of several non-Markovian reservoirs presents an emergent thermal behavior. This thermal behavior is visible at both static and dynamical levels and the system satisfies the fluctuation-dissipation theorem. Our analysis is focused on the exactly solvable model of a weakly interacting driven-dissipative Bose gas in presence of frequency-dependent particle pumping and losses, and is based on a quantum Langevin theory, which we derive starting from a microscopical quantum optics model. For generic non-Markovian reservoirs, we demonstrate that the emergence of thermal properties occurs in the range of frequencies corresponding to low-energy excitations. For the specific case of non-Markovian baths verifying the Kennard-Stepanov relation, we show that pseudothermalization can instead occur at all energy scales. The possible implications regarding the interpretation of thermal laws in low-temperature exciton-polariton experiments are discussed. We finally show that the presence of either a saturable pumping or a dispersive environment leads to a breakdown of the pseudothermalization effect.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lebreuilly, Jose UNSPECIFIED UNSPECIFIED UNSPECIFIED Chiocchetta, Alessio UNSPECIFIED UNSPECIFIED UNSPECIFIED Carusotto, Iacopo UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-192996
DOI:	10.1103/PhysRevA.97.033603
Journal or Publication Title:	Phys. Rev. A
Volume:	97
Number:	3
Date:	2018
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9934
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BOSE-EINSTEIN CONDENSATION; PHOTONS; STATES Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19299