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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.21: Poster

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

Spatially resolved photoluminescence of mono- and bilayer molybdenum ditelluride — •Matthias Kunz1, Sophia Helmrich1, Robert Schneider2, Alexander W. Achtstein1, Ashish Arora2, Bastian Herzog1, Steffen Michaelis de Vasconcellos2, Mirco Kolarczik1, Oliver Schöps1, Rudolf Bratschitsch2, Nina Owschimikow1, and Ulrike Woggon11Institut für Optik und Atomare Physik, Technische Universität Berlin, Germany — 2Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Germany

We study the photoluminescence of a mechanically exfoliated molybdenum ditelluride (MoTe2) flake in the spatial crossover region from monolayer (ML) to bilayer (BL) at low temperatures. To repeatedly address identical locations on the flake, we develop a camera-piezo feedback loop and confirm the reproducibility of the data obtained in different runs. In contrast to other transition metal dichalcogenides (TMD) materials, the MoTe2 BL shows a strong luminescence comparable in intensity to the ML. The peak energy of the BL exciton is red-shifted by about 35 meV with respect to the ML, but displays a shift to larger energies at close distances to the ML/BL border. With edge effects thus influencing the peak positions, our results underline the importance of correct positioning of the excitation spot on TMD flakes.

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