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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Two-dimensional Materials III (joint session HL/CPP)

CPP 34.13: Vortrag

Mittwoch, 3. April 2019, 12:45–13:00, H36

Optical properties of Monolayer MoS₂ exposed to helium ions — Julian Klein^1,2, •Sergio Rey Puentes¹, Michael Lorke³, Matthias Florian³, Florian Sigger^1,2, John Cerne⁴, Jakob Wierzbowski^1,2, Kai Müller^1,2, Lukas Sigl^1,2, Takashi Taniguchi⁵, Kenji Watanabe⁵, Michael Kaniber^1,2, Ursula Wurstbauer^1,2, Michael Knap⁶, Richard Schmidt⁶, Jonathan Finley^1,2, and Alexander Holleitner^1,2 — ¹Walter Schottky Institut and Physik Department, Technische Universität München, Garching, Germany — ²Nanosystems Initiative Munich (NIM), Munich, Germany — ³Institut für Theoretische Physik, Universität Bremen, Bremen, Germany — ⁴Department of Physics, University at Buffalo, The State University of New York, Buffalo, USA — ⁵National Institute for Materials Science, Tsukuba, Japan — ⁶Department of Physics and Institute for Advanced Study, Technical University of Munich, Garching, Germany

We present a spectroscopic study on mono- and few-layers of 2H stacked MoS₂ and WSe₂ exposed with 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. The exposed locations were investigated by Raman spectroscopy, low-temperature confocal micro-photoluminescence (µ-PL) and atomic force microscopy (AFM). Our results demonstrate the potential of helium ion microscopy applied to 2D layered materials for modifying intrinsic optical properties and fundamental understanding of disorder.