Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: 2D Materials 2 (joint session HL/CPP/DS)

CPP 10.5: 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 Holleitner¹ — ¹Walter-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)