SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Charge Density Wave Materials

TT 17.1: Talk

Thursday, September 30, 2021, 10:00–10:15, H6

Condensation signatures of photogenerated interlayer excitons in a van der Waals heterostack — •Johannes Figueiredo¹, Lukas Sigl¹, Florian Sigger¹, Jonas Kiemle¹, Ursula Wurstbauer², and Alexander Holleitner¹ — ¹Walter Schottky Institut, Technical University of Munich — ²Institute of Physics, Westfälische Wilhelms-Universität Münster

Due to large exciton binding energies and long lifetimes, atomistic van der Waals heterostacks of TMDCs present an ideal platform for studying high-temperature condensation of excitons. At cryogenic temperatures, optically generated interlayer excitons in such heterostructures yield several signatures regarding the condensation of the photogenerated excitons. The transition into this state is consistent with the predicted critical condensation temperature above 10K. Our studies provide a first phase-diagram of the achieved quantum degenerate interlayer exciton ensemble. [1]
[1] L. Sigl et. al, Phys. Rev. Research 2, 042044(R) (2020)