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Dipolar and magnetic properties of strongly absorbing hybrid interlayer excitons in pristine bilayer MoS$_2$

By Etienne Lorchat, Malte Selig, Florian Katsch, Kentaro Yumigeta, Sefaattin Tongay, Andreas Knorr, Christian Schneider and Sven Höfling


Van der Waals heterostructures composed of transition metal dichalcogenide monolayers (TMDs) are characterized by their truly rich excitonic properties which are determined by their structural, geometric and electronic properties: In contrast to pure monolayers, electrons and holes can be hosted in different materials, resulting in highly tunable dipolar manyparticle complexes. However, for genuine spatially indirect excitons, the dipolar nature is usually accompanied by a notable quenching of the exciton oscillator strength. Via electric and magnetic field dependent measurements, we demonstrate, that a slightly biased pristine bilayer MoS$_2$ hosts strongly dipolar excitons, which preserve a strong oscillator strength. We scrutinize their giant dipole moment, and shed further light on their orbital- and valley physics via bias-dependent magnetic field measurements.Comment: 7 Pages, 4 Figure

Topics: Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Quantum Gases
Year: 2020
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