American Chemical Society
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Intervalley Scattering of Interlayer Excitons in a MoS2/MoSe2/MoS2 Heterostructure in High Magnetic Field

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journal contribution
posted on 2018-05-23, 00:00 authored by Alessandro Surrente, Łukasz Kłopotowski, Nan Zhang, Michal Baranowski, Anatolie A. Mitioglu, Mariana V. Ballottin, Peter C.M. Christianen, Dumitru Dumcenco, Yen-Cheng Kung, Duncan K. Maude, Andras Kis, Paulina Plochocka
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 MoS2/MoSe2/MoS2 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.