Intervalley Scattering of Interlayer Excitons in a MoS<sub>2</sub>/MoSe<sub>2</sub>/MoS<sub>2</sub> Heterostructure in High Magnetic Field.
basic_science · Level V
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- Record sourced from PubMed, PMID 29791166.
- Also identified by DOI 10.1021/acs.nanolett.8b01484.
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Abstract
Degenerate extrema in the energy dispersion of charge carriers in solids, also referred to as valleys, can be regarded as a binary quantum degree of freedom, which can potentially be used to implement valleytronic concepts in van der Waals heterostructures based on transition metal dichalcogenides. Using magneto-photoluminescence spectroscopy, we achieve a deeper insight into the valley polarization and depolarization mechanisms of interlayer excitons formed across a MoS<sub>2</sub>/MoSe<sub>2</sub>/MoS<sub>2</sub> heterostructure. We account for the nontrivial behavior of the valley polarization as a function of the magnetic field by considering the interplay between exchange interaction and phonon-mediated intervalley scattering in a system consisting of Zeeman-split energy levels. Our results represent a crucial step toward the understanding of the properties of interlayer excitons with strong implications for the implementation of atomically thin valleytronic devices.