Dissipation-driven quantum phase transitions in collective spin systems

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dc.creatorMorrison, S.
dc.creatorParkins, A. S.
dc.date2008-05-09
dc.date2008-09-23
dc.date.accessioned2026-07-07T10:04:12Z
dc.date.available2026-07-07T10:04:12Z
dc.descriptionWe consider two different collective spin systems subjected to strong dissipation -- on the same scale as interaction strengths and external fields -- and show that either continuous or discontinuous dissipative quantum phase transitions can occur as the dissipation strength is varied. First, we consider a well known model of cooperative resonance fluorescence that can exhibit a second-order quantum phase transition, and analyze the entanglement properties near the critical point. Next, we examine a dissipative version of the Lipkin-Meshkov-Glick interacting collective spin model, where we find that either first- or second-order quantum phase transitions can occur, depending only on the ratio of the interaction and external field parameters. We give detailed results and interpretation for the steady state entanglement in the vicinity of the critical point, where it reaches a maximum. For the first-order transition we find that the semiclassical steady states exhibit a region of bistability.
dc.description12 pages, 16 figures, removed section on homodyne spectra
dc.identifierhttps://arxiv.org/abs/0805.1256
dc.identifierhttp://arxiv.org/abs/0805.1256
dc.identifierJ. Phys. B 41, 195502 (2008)
dc.identifierdoi:10.1088/0953-4075/41/19/195502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/169581
dc.subjectQuantum Physics
dc.subjectOther Condensed Matter
dc.titleDissipation-driven quantum phase transitions in collective spin systems
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