Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 3: 2D semiconductors and van der Waals heterostructures I (joint session HL/DS/O)

O 3.11: Vortrag

Montag, 16. März 2020, 12:30–12:45, POT 81

Characterization of interlayer excitons in MoSe2-WSe2 heterostructures in high magnetic fields — •Johannes Holler1, Michael Kempf3, Jonas Zipfel1, Mariana Ballottin2, Anatolie Mitioglu2, Philipp Nagler1, Michael Högen1, Alexey Chernikov1, Peter Christianen2, Christian Schüller1, and Tobias Korn31Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — 2High Field Magnet Laboratory (HFML EMFL), Radboud University Nijmegen, Netherlands — 3Institut für Physik, Universität Rostock, Germany

In the recent years, the research on transition-metal dichalchogenides (TMDCs) and especially their heterostructures has increased a lot. These heterostructures are fabricated by stacking two different TMDCs on top of each other. With the right material combination, a type-II band alignment can be achieved and electrons and holes are spatially separated forming so-called interlayer excitons (IEXs).

Here, we study these IEXs in MoSe2-WSe2 heterostructures. In low-temperature PL measurements in magnetic fields of up to 30T, we observe a giant valley-selective splitting and a resulting near-unity valley polarization. In time-resolved measurements, we track the buildup of IEX valley polarization in the magnetic field. We also find a clear dependence of the magnetic-field behavior of the IEX on the stacking angles.

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