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Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 7: 2D Materials 2 (joint session HL/CPP/DS)

DS 7.5: Vortrag

Montag, 5. September 2022, 16:15–16:30, H36

Signatures of a degenerate many-body state of interlayer excitons in a van der Waals heterostack — •Johannes Figueiredo1, Lukas Sigl1, Florian Sigger1, Jonas Kiemle1, Mirco Troue1, Ursula Wurstbauer2, and Alexander Holleitner11Walter-Schottky-Institut, Technical University of Munich — 2Institute of Physics, Westfälische Wilhelms-Universität Münster

In atomistic van der Waals heterostacks of transition metal dichalcogenides, the reduced dimensionality and changing dielectric environement leads to the formation of stronlgy bound excitons. Optically generated interlayer excitons exhibit an additional spatial separation of the electron-hole pair with a reduced overlap of the electrons’ and holes’ wave-functions, evidenced through their long lifetimes. These long-lived, photogenerated composite bosons yield several signatures of a quantum degenerate many-body system at cryogenic temperatures. The emergence of this state is in accordance with theoretical predictions of a critical condensation temperature above 10K. We present new insights into the phase-diagram of such interlayer exciton ensembles. [1]
[1] L. Sigl et al., Phys. Rev. Research 2, 042044(R) (2020)

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