Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Two-dimensional Materials III (joint session HL/CPP)
CPP 34.13: Talk
Wednesday, April 3, 2019, 12:45–13:00, H36
Optical properties of Monolayer MoS2 exposed to helium ions — Julian Klein1,2, •Sergio Rey Puentes1, Michael Lorke3, Matthias Florian3, Florian Sigger1,2, John Cerne4, Jakob Wierzbowski1,2, Kai Müller1,2, Lukas Sigl1,2, Takashi Taniguchi5, Kenji Watanabe5, Michael Kaniber1,2, Ursula Wurstbauer1,2, Michael Knap6, Richard Schmidt6, Jonathan Finley1,2, and Alexander Holleitner1,2 — 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.