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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.7: Poster

Monday, March 12, 2018, 17:30–19:30, Poster B

Valley polarization dynamics of interlayer excitons in dichalcogenide heterostructures in high magnetic fields — •Johannes Holler1, Jonas Zipfel1, Mariana Ballotin2, Anatolie Mitioglu2, Michael Kempf1, Philipp Nagler1, Fabian Mooshammer1, Alexey Chernikov1, Peter Christianen2, Christian Schüller1, and Tobias Korn11Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — 2High Field Magnet Laboratory (HFML EMFL), Radboud University Nijmegen, Netherlands

In the recent years, research on two-dimensional materials has been a rapidly expanding field. Among these materials, a promising class are the transition-metal dichalcogenides (TMDCs). Besides very interesting physics of monolayers, such as spin-valley locking, these TMDCs can be combined to heterostructures, revealing new excitonic properties.

Here, we study MoSe2-WSe2 heterostructures, which create a staggered band alignment so that optically excited electron-hole pairs are spatially separated, leading to the formation of interlayer excitons (IEXs). In magnetic fields of up to 30 Tesla, we observe a giant valley-selective splitting in low-temperature photoluminescence measurements and a resulting near-unity valley polarization. Furthermore, we probe the valley dynamics of the IEX in dependence of the magnetic field. We are able to observe the build-up of the valley polarization after unpolarized excitation, revealing different dynamics and lifetimes for the different valleys.

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