Universität zu Köln

Diessel, Oriana K., Diehl, Sebastian and Chiocchetta, Alessio ORCID: 0000-0003-1782-966X (2022). Emergent Kardar-Parisi-Zhang Phase in Quadratically Driven Condensates. Phys. Rev. Lett., 128 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

In bosonic gases at thermal equilibrium, an external quadratic drive can induce a Bose-Einstein condensation described by the Ising transition, as a consequence of the explicitly broken U(1) phase rotation symmetry down to Z(2). However, in physical realizations such as exciton polaritons and nonlinear photonic lattices, thermal equilibrium is lost and the state is rather determined by a balance between losses and external drive. A fundamental question is then how nonequilibrium fluctuations affect this transition. Here, we show that in a two-dimensional driven-dissipative Bose system the Ising phase is suppressed and replaced by a nonequilibrium phase featuring Kardar-Parisi-Zhang (KPZ) physics. Its emergence is rooted in a U(1)-symmetry restoration mechanism enabled by the strong fluctuations in reduced dimensionality. Moreover, we show that the presence of the quadratic drive term enhances the visibility of the KPZ scaling, compared to two-dimensional U(1)-symmetric gases, where it has remained so far elusive.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Diessel, Oriana K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Diehl, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Chiocchetta, Alessio UNSPECIFIED orcid.org/0000-0003-1782-966X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-667753
DOI:	10.1103/PhysRevLett.128.070401
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	128
Number:	7
Date:	2022
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLARITON; EQUATION; RENORMALIZATION; DYNAMICS; ORDER; MODEL Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66775