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 Höfling^1,5, and Christian Schneider¹ — ¹Technische 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.