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Intervalley Scattering of Interlayer Excitons in a MoS$_2$/MoSe$_2$/MoS$_2$ Heterostructure in High Magnetic Field

Authors :
Surrente, Alessandro
Klopotowski, Lukasz
Zhang, Nan
Baranowski, Michal
Mitioglu, Anatolie A.
Ballottin, Mariana V.
Christianen, Peter C. M.
Dumcenco, Dumitru
Kung, Yen-Cheng
Maude, Duncan K.
Kis, Andras
Plochocka, Paulina
Publication Year :
2018

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$_2$/MoSe$_2$/MoS$_2$ heterostructure. We account for the non-trivial 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 towards the understanding of the properties of interlayer excitons, with strong implications for the implementation of atomically thin valleytronic devices.<br />Comment: just accepted in Nano Letters, DOI: 10.1021/acs.nanolett.8b01484

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1805.10010
Document Type :
Working Paper
Full Text :
https://doi.org/10.1021/acs.nanolett.8b01484