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HL: Fachverband Halbleiterphysik

HL 74: Poster IIIA

HL 74.22: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/2OG

Optical phonon mediated valley depolarization in monolayer WSe2 — •Robin Bernhardt, Julian Wagner, Jingyi Zhu, and Paul van Loosdrecht — Universität zu Köln, II. Physikalisches Institut, D-50937 Köln, Germany

The valley degree of freedom in semiconducting transition metal dichalcogenide monolayers is considered as a potential basis for novel information technology. Key to this is the degree and lifetime of an induced valley polarization. We investigated the temperature dependent transient valley polarization using circularly polarized and femtosecond time-resolved photoluminescence spectroscopy on exfoliated WSe2. Using these data, the intervalley scattering rate is evaluated over a broad temperature range, showing that optical-phonon assisted scattering is the dominant intervalley scattering mechanism.