Extended spatial coherence of interlayer excitons in MoSe${}_2$/WSe${}_2$ heterobilayers

Abstract

We report on the spatial coherence of interlayer exciton ensembles as formed in MoSe${}_2$/WSe${}_2$ 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 coherence length and the temporal coherence time 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.

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Cited by in corpus (8)

• Exciton-phonon-scattering: A competition between bosonic and fermionic nature of bound electron-hole pairs
• Realizing Topological Superconductivity in Tunable Bose-Fermi Mixtures with Transition Metal Dichalcogenide Heterostructures
• Excitonic Instability in Ta2Pd3Te5 Monolayer
• Fermionic vs. bosonic thermalization in the phonon-driven exciton dynamics: An analytic dimensionality study
• Electrically tunable MoSe${}_2$/WSe${}_2$ heterostructure-based quantum dot
• Laterally Extended States of Interlayer Excitons in Reconstructed MoSe${}_2$/WSe${}_2$ Heterostructures
• Long-range spatial extension of exciton states in van der Waals heterostructure
• Quantum siphoning of finely spaced interlayer excitons in reconstructed MoSe2/WSe2 heterostructures