Dresden 2014 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Graphene-Like Materials: Silicene, MoS₂ and Relatives (joint session HL/DY/DS/MA/O/TT)

DY 30.7: Talk

Thursday, April 3, 2014, 11:45–12:00, POT 081

The effect of substrate and environment on the elementary excitations of MoS₂ — •Eric Parzinger¹, Marina Hoheneder¹, Bastian Miller¹, Anna Cattani-Scholz¹, Alexander Holleitner¹, Joel W. Ager², and Ursula Wurstbauer¹ — ¹Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4a, 85748 Garching (Germany) — ²Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94702 (United States)

The novel two-dimensional layered ’van-der Waals’ material Molybdenum disulfide (MoS₂) is investigated using inelastic and resonant light scattering - a contactless and extremely versatile tool - to study phonon and electronic excitations. In particular, we focus on the influence of different supporting materials (SiO₂, sapphire and SAMs of organic molecules) as well as various environmental conditions (ambient, vacuum and water) on the low energy excitations of MoS₂. We find that both, different substrate and environment give rise to a significant modification of the most prominent Raman modes, whereas a monolayer is most effected by the environmental conditions. We gratefully acknowledge financial support by BaCaTec.