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dc.contributor.authorChiacchio, EIRen
dc.contributor.authorNunnenkamp, Andreasen
dc.date.accessioned2018-11-20T00:30:20Z
dc.date.available2018-11-20T00:30:20Z
dc.date.issued2018-08-15en
dc.identifier.issn2469-9926
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285435
dc.description.abstract© 2018 American Physical Society. We investigate the physics of a gas of ultracold atoms coupled to three single-mode optical cavities and transversely pumped with a laser. Recent work has demonstrated that, for two cavities, the Z2 symmetries of each cavity can be combined into a global U(1) symmetry [J. Léonard et al., Nature (London) 543, 87 (2017)NATUAS0028-083610.1038/nature21067]. Here we show that when adding an extra cavity mode, the low-energy description of this system can additionally exhibit an SO(3) rotational symmetry which can be spontaneously broken. This leads to a superradiant phase transition in all the cavities simultaneously, and the appearance of Goldstone and amplitude modes in the excitation spectrum. We determine the phase diagram of the system, which shows the emergence and breaking of the continuous symmetries and displays first- and second-order phase transitions. We also obtain the excitation spectrum for each phase and discuss the atomic self-organized structures that emerge in the different superradiant phases. We argue that coupling the atoms equally to n different modes will in general generate a global SO(n) symmetry if the mode frequencies can be tuned to the same value.
dc.titleEmergence of continuous rotational symmetries in ultracold atoms coupled to optical cavitiesen
dc.typeArticle
prism.issueIdentifier2en
prism.publicationDate2018en
prism.publicationNamePhysical Review Aen
prism.volume98en
dc.identifier.doi10.17863/CAM.32795
dcterms.dateAccepted2018-07-19en
rioxxterms.versionofrecord10.1103/PhysRevA.98.023617en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-08-15en
dc.contributor.orcidNunnenkamp, Andreas [0000-0003-2390-7636]
dc.identifier.eissn2469-9934
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idRoyal Society (uf130303)
pubs.funder-project-idEPSRC (EP/N509620/1)
rioxxterms.freetoread.startdate2019-08-15


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