Stability of High-Density Two-Dimensional Excitons against a Mott Transition in High Magnetic Fields Probed by Coherent Terahertz Spectroscopy

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dc.citation.articleNumber207402en_US
dc.citation.issueNumber20en_US
dc.citation.journalTitlePhysical Review Lettersen_US
dc.citation.volumeNumber117en_US
dc.contributor.authorZhang, Qien_US
dc.contributor.authorWang, Yongruien_US
dc.contributor.authorGao, Weiluen_US
dc.contributor.authorLong, Zhongquen_US
dc.contributor.authorWatson, John D.en_US
dc.contributor.authorManfra, Michael J.en_US
dc.contributor.authorBelyanin, Alexeyen_US
dc.contributor.authorKono, Junichiroen_US
dc.date.accessioned2016-12-01T17:29:09Zen_US
dc.date.available2016-12-01T17:29:09Zen_US
dc.date.issued2016en_US
dc.description.abstractWe have performed time-resolved terahertz absorption measurements on photoexcited electron-hole pairs in undoped GaAs quantum wells in magnetic fields. We probed both unbound- and bound-carrier responses via cyclotron resonance and intraexciton resonance, respectively. The stability of excitons, monitored as the pair density was systematically increased, was found to dramatically increase with increasing magnetic field. Specifically, the 1s−2p− intraexciton transition at 9 T persisted up to the highest density, whereas the 1s−2p feature at 0 T was quickly replaced by a free-carrier Drude response. Interestingly, at 9 T, the 1s−2p− peak was replaced by free-hole cyclotron resonance at high temperatures, indicating that 2D magnetoexcitons do dissociate under thermal excitation, even though they are stable against a density-driven Mott transition.en_US
dc.identifier.citationZhang, Qi, Wang, Yongrui, Gao, Weilu, et al.. "Stability of High-Density Two-Dimensional Excitons against a Mott Transition in High Magnetic Fields Probed by Coherent Terahertz Spectroscopy." <i>Physical Review Letters,</i> 117, no. 20 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevLett.117.207402.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.117.207402en_US
dc.identifier.urihttps://hdl.handle.net/1911/92738en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleStability of High-Density Two-Dimensional Excitons against a Mott Transition in High Magnetic Fields Probed by Coherent Terahertz Spectroscopyen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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