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dc.contributor.authorZhang, Qi
Wang, Yongrui
Gao, Weilu
Long, Zhongqu
Watson, John D.
Manfra, Michael J.
Belyanin, Alexey
Kono, Junichiro
dc.date.accessioned 2016-12-01T17:29:09Z
dc.date.available 2016-12-01T17:29:09Z
dc.date.issued 2016
dc.identifier.citation Zhang, 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." Physical Review Letters, 117, no. 20 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevLett.117.207402.
dc.identifier.urihttps://hdl.handle.net/1911/92738
dc.description.abstract We 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.
dc.language.iso eng
dc.publisher American Physical Society
dc.rights Article 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.
dc.title Stability of High-Density Two-Dimensional Excitons against a Mott Transition in High Magnetic Fields Probed by Coherent Terahertz Spectroscopy
dc.type Journal article
dc.citation.journalTitle Physical Review Letters
dc.citation.volumeNumber 117
dc.citation.issueNumber 20
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.117.207402
dc.type.publication publisher version
dc.citation.articleNumber 207402


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