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Nonequilibrium effective field theory for absorbing state phase transitions in driven open quantum spin systems

Buchhold, Michael; Everest, Benjamin; Marcuzzi, Matteo; Lesanovsky, Igor; Diehl, Sebastian

Authors

Michael Buchhold michael.buchhold@uni-koeln.de

Benjamin Everest benjamin.everest@nottingham.ac.uk

Matteo Marcuzzi matteo.marcuzzi@nottingham.ac.uk

Igor Lesanovsky igor.lesanovsky@nottingham.ac.uk

Sebastian Diehl sebastian.diehl@uni-koeln.de



Abstract

Phase transitions to absorbing states are among the simplest examples of critical phenomena out of equilibrium. The characteristic feature of these models is the presence of a fluctuationless configuration which the dynamics cannot leave, which has proved a rather stringent requirement in experiments. Recently, a proposal to seek such transitions in highly tuneable systems of cold atomic gases offers to probe this physics and, at the same time, to investigate the robustness of these transitions to quantum coherent effects. Here we specifically focus on the interplay between classical and quantum fluctuations in a simple driven open quantum model which, in the classical limit, reproduces a contact process, which is known to undergo a continuous transition in the "directed percolation" universality class. We derive an effective long-wavelength field theory for the present class of open spin systems and show that, due to quantum fluctuations, the nature of the transition changes from second to first order, passing through a bicritical point which appears to belong instead to the "tricritical directed percolation" class.

Journal Article Type Article
Publication Date Jan 27, 2017
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 95
APA6 Citation Buchhold, M., Everest, B., Marcuzzi, M., Lesanovsky, I., & Diehl, S. (2017). Nonequilibrium effective field theory for absorbing state phase transitions in driven open quantum spin systems. Physical Review B, 95, doi:10.1103/PhysRevB.95.014308
DOI https://doi.org/10.1103/PhysRevB.95.014308
Keywords Absorbing state phase transitions, Open quantum systems, Non-equilibrium universality
Publisher URL http://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.014308
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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