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Dissipation-driven quantum phase transitions and symmetry breaking
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Antal upphovsmän: 22018 (Engelska)Ingår i: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 98, nr 4, artikel-id 042113Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

By considering a solvable driven-dissipative quantum model, we demonstrate that continuous phase transitions in dissipative systems may occur without an accompanying symmetry breaking. As such, the underlying mechanism for this type of transition is qualitatively different from that of continuous equilibrium phase transitions. In our model, the transition is solely a result of the interplay between Hamiltonian and dissipative dynamics and manifests as a nonanalyticity in the steady state. (rho) over cap (ss) in the thermodynamic limit. Based on knowledge from critical classical models we suggest that this behavior derives from a rounding of a first-order phase transition into a continuous one due to large environment-induced fluctuations. Despite being conceptually different from the traditional continuous transitions, we show that expectations of local observables can still be characterized by a set of critical exponents.

Ort, förlag, år, upplaga, sidor
2018. Vol. 98, nr 4, artikel-id 042113
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:su:diva-161939DOI: 10.1103/PhysRevA.98.042113ISI: 000447291200002OAI: oai:DiVA.org:su-161939DiVA, id: diva2:1262665
Tillgänglig från: 2018-11-12 Skapad: 2018-11-12 Senast uppdaterad: 2018-11-12Bibliografiskt granskad

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Larson, Jonas
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