Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 15: Focus Session: Two-dimensional materials II (joined session with TT)

HL 15.2: Talk

Monday, March 20, 2017, 15:15–15:30, POT 81

Optical properties of atomically thin MoS2 exposed to helium ions — •Anna Nolinder¹, Julian Klein^1,2, Agnieszka Kuc⁴, Marcus Altzschner¹, Jakob Wierzbowski¹, Florian Sigger¹, Franz Kreupl³, Thomas Heine⁴, Jonathan Finley^1,2, Ursula Wurstbauer^1,2, Alexander Holleitner^1,2, and Michael Kaniber¹ — ¹Walter Schottky Institut und Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany — ²Nanosystems Initiative Munich (NIM), Schellingstr. 4, 80799 München, Germany — ³Department of Hybrid Electronic Systems, Technische Universität München, Arcisstr. 21, 80333 Munich, Germany — ⁴Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig, Germany

We present a spectroscopic study on atomically thin MoS2 exposed to helium ions. Distinct changes of the first-order Raman bands, additional defect luminescence and strong modification of the intrinsic valley spin relaxation properties are observed, shedding light on the effect of disorder on the optical properties and valley spin relaxation mechanisms. Moreover, our observations are in good qualitative agreement with Density Functional Theory calculations.