Helicity-resolved magneto-photoluminescence reveals that the unequal spacing of the dipolar exciton ladder in R-stacked WSe₂/WS₂ arises from triplet and singlet spin-valley two-exciton states, not simple occupation-number physics.
Extended spatial coherence of interlayer excitons in MoSe$_2$/WSe$_2$ heterobilayers
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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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Unveiling the Spin-Valley Structure of Dipolar Exciton Ladders in R-stacked WSe$_2$/WS$_2$ Moir\'e Heterobilayers
Helicity-resolved magneto-photoluminescence reveals that the unequal spacing of the dipolar exciton ladder in R-stacked WSe₂/WS₂ arises from triplet and singlet spin-valley two-exciton states, not simple occupation-number physics.