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Visualising Berry phase and diabolical points in a quantum exciton-polariton billiard

Estrecho, Eliezer (Eli); Gao, Tingge; Brodbeck, Sebastian; Kamp, Martin; Schneider, Christian; Höfling, S; Truscott, Andrew; Ostrovskaya, Elena

Description

Diabolical points (spectral degeneracies) can naturally occur in spectra of two-dimensional quantum systems and classical wave resonators due to simple symmetries. Geometric Berry phase is associated with these spectral degeneracies. Here, we demonstrate a diabolical point and the corresponding Berry phase in the spectrum of hybrid light-matter quasiparticles - exciton-polaritons in semiconductor microcavities. It is well known that sufficiently strong optical pumping can drive...[Show more]

dc.contributor.authorEstrecho, Eliezer (Eli)
dc.contributor.authorGao, Tingge
dc.contributor.authorBrodbeck, Sebastian
dc.contributor.authorKamp, Martin
dc.contributor.authorSchneider, Christian
dc.contributor.authorHöfling, S
dc.contributor.authorTruscott, Andrew
dc.contributor.authorOstrovskaya, Elena
dc.date.accessioned2018-11-29T22:56:48Z
dc.date.available2018-11-29T22:56:48Z
dc.identifier.issn2045-2322
dc.identifier.urihttp://hdl.handle.net/1885/153632
dc.description.abstractDiabolical points (spectral degeneracies) can naturally occur in spectra of two-dimensional quantum systems and classical wave resonators due to simple symmetries. Geometric Berry phase is associated with these spectral degeneracies. Here, we demonstrate a diabolical point and the corresponding Berry phase in the spectrum of hybrid light-matter quasiparticles - exciton-polaritons in semiconductor microcavities. It is well known that sufficiently strong optical pumping can drive exciton-polaritons to quantum degeneracy, whereby they form a macroscopically populated quantum coherent state similar to a Bose-Einstein condensate. By pumping a microcavity with a spatially structured light beam, we create a two-dimensional quantum billiard for the exciton-polariton condensate and demonstrate a diabolical point in the spectrum of the billiard eigenstates. The fully reconfigurable geometry of the potential walls controlled by the optical pump enables a striking experimental visualization of the Berry phase associated with the diabolical point. The Berry phase is observed and measured by direct imaging of the macroscopic exciton-polariton probability densities.
dc.format.mimetypeapplication/pdf
dc.publisherNature Publishing Group
dc.sourceScientific Reports
dc.titleVisualising Berry phase and diabolical points in a quantum exciton-polariton billiard
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume6
dc.date.issued2016
local.identifier.absfor020501 - Classical and Physical Optics
local.identifier.ariespublicationa383154xPUB5095
local.type.statusPublished Version
local.contributor.affiliationEstrecho, Eliezer (Eli), College of Science, ANU
local.contributor.affiliationGao, Tingge, College of Science, ANU
local.contributor.affiliationBrodbeck, Sebastian , Technische Physik and Wilhelm-Conrad-Röntgen Research Center for Complex Material Systems
local.contributor.affiliationKamp, Martin, University of Wurzburg
local.contributor.affiliationSchneider, Christian, Technische Physik and Wilhelm-Conrad-Röntgen Research Center for Complex Material Systems
local.contributor.affiliationHöfling, S, University of St. Andrews
local.contributor.affiliationTruscott, Andrew, College of Science, ANU
local.contributor.affiliationOstrovskaya, Elena, College of Science, ANU
local.bibliographicCitation.issue37653
local.identifier.doi10.1038/srep37653
dc.date.updated2018-11-29T08:14:04Z
local.identifier.scopusID2-s2.0-84997132391
local.identifier.thomsonID000388485400001
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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