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DS: Fachverband Dünne Schichten
DS 17: Poster Session I
DS 17.33: Poster
Dienstag, 13. März 2018, 18:15–20:15, Poster B
Magnetic-Field-Induced Rotation of Polarized Light Emission from Monolayer WS2 — •Robert Schmidt1, Ashish Arora1, Gerd Plechinger2, Philipp Nagler2, Andrés Granados del Águila3, Mariana V. Ballottin3, Peter C. M. Christianen3, Steffen Michaelis de Vasconcellos1, Christian Schüller2, Tobias Korn2, and Rudolf Bratschitsch1 — 1Institute of Physics and Center for Nanotechnology, University of Münster, 48149 Münster, Germany — 2Department of Physics, University of Regensburg, 93040 Regensburg, Germany — 3High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
Atomically thin transition metal dichalcogenides (TMDCs) are potential building blocks of future applications in the field of "valleytronics". Valley polarization and valley coherence are two important physical mechanisms observed in monolayer TMDCs, such as MoS2, WS2, and WSe2. We investigate the effect of valley coherence in a WS2 monolayer by measuring the linear polarization of the photoluminescence from the A exciton in high magnetic fields. The magnetic field causes a valley Zeeman splitting of the K+ and K− valleys of 8 meV at 30 T. The splitting causes a rotation of the emission polarization with respect to the excitation, accompanied by a reduction of the polarization degree. Both of these phenomena are explained with a model based on two noninteracting coherent two-level systems. Our results light the way for manipulating the phase between the K+ and K− valley, which is important for future valleytronic devices.