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Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: 2D semiconductors and van der Waals heterostructures II (joint session HL/DS)

HL 20.9: Vortrag

Montag, 16. März 2020, 17:45–18:00, POT 81

Bosonic Condensation in a hybrid monolayer MoSe2-GaAs-microcavity — •Max Waldherr1, Nils Lundt1, Martin Klaas1, Simon Betzold1, Matthias Wurdack2, Anton Nalitov3, Sefaattin Tongay4, Elena Ostrovskaya2, Alexey Kavokin3, Sven Höfling1,5, and Christian Schneider11Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Germany — 2Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australia — 3Physics and Astronomy School, University of Southampton, Highfield, Southampton, UK — 4School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona, USA — 5SUPA, School of Physics and Astronomy, St. Andrews, UK

We observe bosonic condensation in a hybrid exciton-polariton system in the strong-coupling regime, with monolayer MoSe2 and GaAs quantum well excitons collectively coupling to a Tamm-plasmon mode. The onset of condensation in the hybrid polariton branch manifests in a superlinear increase of its emission intensity, accompanied by a distinct collapse of the linewidth, a core sign of temporal coherence. At further increasing pumping powers, we observe a continuing blueshift of the resonance originating from particle interactions with uncondensed excitons in the reservoir states. The spin-polarized emission is a clear sign of valley-selective condensation.

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