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dc.contributor.authorJuggins, R. T.
dc.contributor.authorKeeling, J.
dc.contributor.authorSzymańska, M. H.
dc.date.accessioned2018-10-03T11:30:11Z
dc.date.available2018-10-03T11:30:11Z
dc.date.issued2018-10-03
dc.identifier.citationJuggins , R T , Keeling , J & Szymańska , M H 2018 , ' Coherently driven microcavity-polaritons and the question of superfluidity ' , Nature Communications , vol. 9 , 4062 . https://doi.org/10.1038/s41467-018-06436-2en
dc.identifier.issn2041-1723
dc.identifier.otherPURE: 255653086
dc.identifier.otherPURE UUID: 2b849255-e74f-4440-b52d-6d5f52f77342
dc.identifier.otherArXiv: http://arxiv.org/abs/1806.09581v1
dc.identifier.otherScopus: 85054299479
dc.identifier.otherORCID: /0000-0002-4283-552X/work/49052136
dc.identifier.otherWOS: 000446333400002
dc.identifier.urihttps://hdl.handle.net/10023/16137
dc.descriptionM.H.S. acknowledges financial support from EPSRC (Grants no. EP/I028900/2 and no. EP/K003623/2) and J.K. from EPSRC program Hybrid Polaritonics (EP/M025330/1).en
dc.description.abstractDue to their driven-dissipative nature, photonic quantum fluids present new challenges in understanding superfluidity. Some associated effects have been observed, and notably the report of nearly dissipationless flow for coherently driven microcavity-polaritons was taken as a 'smoking gun' for superflow. Here we show that the superfluid response - the difference between responses to longitudinal and transverse forces - is zero for coherently driven polaritons. This is a direct consequence of the gapped excitation spectrum caused by external phase locking. Furthermore, while a normal component exists at finite pump momentum, the remainder forms a rigid state that does not respond to either longitudinal or transverse perturbations. Interestingly, the total response almost vanishes when the real part of the excitation spectrum has a linear dispersion at low frequency, characteristic of equilibrium bosonic superfluids, which was the regime investigated experimentally. These results suggest that the observed suppression of scattering should be interpreted as a sign of this new rigid state and not of a superfluid.
dc.format.extent8
dc.language.isoeng
dc.relation.ispartofNature Communicationsen
dc.rightsCopyright © The Author(s) 2018. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/en
dc.subjectQC Physicsen
dc.subjectT-DASen
dc.subject.lccQCen
dc.titleCoherently driven microcavity-polaritons and the question of superfluidityen
dc.typeJournal articleen
dc.contributor.sponsorEPSRCen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.identifier.doihttps://doi.org/10.1038/s41467-018-06436-2
dc.description.statusPeer revieweden
dc.date.embargoedUntil2018-10-02
dc.identifier.grantnumberEP/M025330/1en


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