Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 59: 2D Semiconductors and van der Waals Heterostructures VI
HL 59.2: Talk
Friday, March 21, 2025, 09:45–10:00, H15
Signature of Rydberg-like states of interlayer excitons in MoSe2/WSe2 heterostructures — •Chirag Chandrakant Palekar1, Paulo E. Faria Junior2, Tobias Manthai1, Maximilian Nagel1, Bhabani Sankar Sahoo1, Shachi Machchhar1, Avijit Barua1, Jaroslav Fabian2, Barbara Rosa1, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany — 2Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany
The heterostructures of transition metal dichalcogenides (TMDCs), formed by the stacking of different TMDC monolayers (MLs), facilitates the formation of spatially indirect interlayer excitons (IX). Due to the higher binding energy, the excited excitonic states have typically been observed in TMDC monolayers for over a decade. Nevertheless, the Rydberg-like higher-order states of the IX in WSe2/MoSe2 HSs have thus far remained undetected due to their weak oscillator strength. In this work, we employ photoluminescence excitation (PLE) spectroscopy to identify the signatures of Rydberg-like higher order states of IX in WSe2/MoSe2 HSs. By examining HSs with varying twist angles, we are able to gain comprehensive insight into the twist angle dependence of such excited states of IX. We compare experimental and theoretical results on the twist angle-dependent behavior of observed states, providing a systematic investigation that advances current understanding of the optical and electronic properties of TMDC HS systems.
Keywords: TMDC heterostructures; Rydberg excitons; Twisted heterostructures; higher order IX states