Universität zu Köln

Marcuzzi, Matteo ORCID: 0000-0001-7342-2595, Buchhold, Michael ORCID: 0000-0001-5194-9388, Diehl, Sebastian and Lesanovsky, Igor ORCID: 0000-0001-9660-9467 (2016). Absorbing State Phase Transition with Competing Quantum and Classical Fluctuations. Phys. Rev. Lett., 116 (24). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Stochastic processes with absorbing states feature examples of nonequilibrium universal phenomena. While the classical regime has been thoroughly investigated in the past, relatively little is known about the behavior of these nonequilibrium systems in the presence of quantum fluctuations. Here, we theoretically address such a scenario in an open quantum spin model which, in its classical limit, undergoes a directed percolation phase transition. By mapping the problem to a nonequilibrium field theory, we show that the introduction of quantum fluctuations stemming from coherent, rather than statistical, spin flips alters the nature of the transition such that it becomes first order. In the intermediate regime, where classical and quantum dynamics compete on equal terms, we highlight the presence of a bicritical point with universal features different from the directed percolation class in a low dimension. We finally propose how this physics could be explored within gases of interacting atoms excited to Rydberg states.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Marcuzzi, Matteo UNSPECIFIED orcid.org/0000-0001-7342-2595 UNSPECIFIED Buchhold, Michael UNSPECIFIED orcid.org/0000-0001-5194-9388 UNSPECIFIED Diehl, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Lesanovsky, Igor UNSPECIFIED orcid.org/0000-0001-9660-9467 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-272146
DOI:	10.1103/PhysRevLett.116.245701
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	116
Number:	24
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MANY-BODY PHENOMENA; INFORMATION; DYNAMICS; ATOMS Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27214