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Collective excitations of a bound-in-the-continuum condensate

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dc.contributor.authorGrudinina, A.
dc.contributor.authorEfthymiou-Tsironi, M.
dc.contributor.authorArdizzone, V.
dc.contributor.authorVoronova, N.
dc.contributor.authorГрудинина, Анна Михайловна
dc.contributor.authorВоронова, Нина Сергеевна
dc.date.accessioned2024-12-28T11:38:42Z
dc.date.available2024-12-28T11:38:42Z
dc.date.issued2023
dc.description.abstractSpectra of low-lying elementary excitations are critical to characterize properties of bosonic quantum fluids. Usually these spectra are difficult to observe, due to low occupation of non-condensate states compared to the ground state. Recently, low-threshold Bose-Einstein condensation was realised in a symmetry-protected bound state in the continuum, at a saddle point, thanks to coupling of this electromagnetic resonance to semiconductor excitons. While it has opened the door to long-living polariton condensates, their intrinsic collective properties are still unexplored. Here we unveil the peculiar features of the Bogoliubov spectrum of excitations in this system. Thanks to the dark nature of the bound-in-the-continuum state, collective excitations lying directly above the condensate become observable in enhanced detail. We reveal interesting aspects, such as energy-flat parts of the dispersion characterized by two parallel stripes in photoluminescence pattern, pronounced linearization at non-zero momenta in one of the directions, and a strongly anisotropic velocity of sound.
dc.identifier.citationCollective excitations of a bound-in-the-continuum condensate / Grudinina, A. [et al.] // Nature Communications. - 2023. - 14. - № 1. - 10.1038/s41467-023-38939-y
dc.identifier.doi10.1038/s41467-023-38939-y
dc.identifier.urihttps://www.doi.org/10.1038/s41467-023-38939-y
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85161952675&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:001007854800001
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/30223
dc.relation.ispartofNature Communications
dc.subjectBose-Einstein Condensation
dc.subjectPolariton Condensation
dc.titleCollective excitations of a bound-in-the-continuum condensate
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue1
oaire.citation.volume14
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relation.isAuthorOfPublicationf74b9733-9e74-41cc-b5ee-accd625344aa
relation.isAuthorOfPublication.latestForDiscovery83943bf7-e65d-43af-98bb-c5361983f0c8
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