Extended Spatial Coherence of Interlayer Excitons in MoSe2/WSe2 Heterobilayers

Mirco Troue; Johannes Figueiredo; Lukas Sigl; Christos Paspalides; Manuel Katzer; Takashi Taniguchi; Kenji Watanabe; Malte Selig; Andreas Knorr; Ursula Wurstbauer; Alexander W. Holleitner

doi:10.1103/PhysRevLett.131.036902

Extended Spatial Coherence of Interlayer Excitons in MoSe2/WSe2 Heterobilayers

Mirco Troue, Johannes Figueiredo, Lukas Sigl, Christos Paspalides, Manuel Katzer, Takashi Taniguchi, Kenji Watanabe, Malte Selig, Andreas Knorr, Ursula Wurstbauer, Alexander W. Holleitner

Chair of Nanotechnology and Nanomaterials

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We report on the spatial coherence of interlayer exciton ensembles as formed 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 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.

Original language	English
Article number	036902
Journal	Physical Review Letters
Volume	131
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.131.036902
State	Published - 21 Jul 2023

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title = "Extended Spatial Coherence of Interlayer Excitons in MoSe2/WSe2 Heterobilayers",

abstract = "We report on the spatial coherence of interlayer exciton ensembles as formed 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 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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T1 - Extended Spatial Coherence of Interlayer Excitons in MoSe2/WSe2 Heterobilayers

AU - Troue, Mirco

AU - Figueiredo, Johannes

AU - Sigl, Lukas

AU - Paspalides, Christos

AU - Katzer, Manuel

AU - Taniguchi, Takashi

AU - Watanabe, Kenji

AU - Selig, Malte

AU - Knorr, Andreas

AU - Wurstbauer, Ursula

AU - Holleitner, Alexander W.

PY - 2023/7/21

Y1 - 2023/7/21

N2 - We report on the spatial coherence of interlayer exciton ensembles as formed 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 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.

AB - We report on the spatial coherence of interlayer exciton ensembles as formed 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 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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Extended Spatial Coherence of Interlayer Excitons in MoSe2/WSe2 Heterobilayers

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