Extended spatial coherence of interlayer excitons in van der Waals heterostructures

J. Figueiredo; M. Troue; U. Wurstbauer; A. W. Holleitner

doi:10.1117/12.3001656

12 March 2024 Extended spatial coherence of interlayer excitons in van der Waals heterostructures

J. Figueiredo, M. Troue, U. Wurstbauer, A. W. Holleitner

Proceedings Volume 12888, 2D Photonic Materials and Devices VII; 1288803 (2024) https://doi.org/10.1117/12.3001656
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

We report on the spatial and temporal coherence of interlayer exciton ensembles as photoexcited in MoSe₂/WSe₂ heterostructures and characterized by point-inversion Michelson-Morley interferometry. Below 10 K, the measured spatial coherence length of the interlayer excitons reaches values equivalent to the lateral expansion of the exciton ensembles. In this regime, the light emission of the excitons turns out to be homogeneously broadened in energy with a high temporal coherence. At higher temperatures, both the spatial and temporal coherence lengths decrease, most likely because of thermal processes. The presented findings point towards a spatially extended, coherent many-body state of interlayer excitons at low temperature.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

J. Figueiredo, M. Troue, U. Wurstbauer, and A. W. Holleitner "Extended spatial coherence of interlayer excitons in van der Waals heterostructures", Proc. SPIE 12888, 2D Photonic Materials and Devices VII, 1288803 (12 March 2024); https://doi.org/10.1117/12.3001656

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