Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 88: Graphene-like materials: Silicene, MoS₂ and relatives (with DY/MA/O/TT)

HL 88.3: Talk

Thursday, April 3, 2014, 10:30–10:45, POT 081

Optical and vibrational properties of MoS2 — •Ludger Wirtz¹, Alejandro Molina-Sanchez¹, and Kerstin Hummer² — ¹Physics and Materials Science Research Unit, University of Luxembourg — ²Faculty of Physics, University of Vienna, Austria

Monolayer MoS2 is currently receiving a lot of attention as a potential alternative to graphene. Its band gap of about 2eV (depending on the dielectric environment) makes it a suitable candidate for thin-film electronics. The optical and vibrational properties of mono-layer, few-layer, and bulk are seemingly straightforward to calculate. Nevertheless some surprises occur: the phonon dispersion displays an anomalous Davydov splitting and the optical absorption spectra display a rich structure of excitonic peaks in the band-gap and in the continuum of interband transitions. We give a short review of the state-of-the art and discuss recent advances in the understanding of the influence of the substrate on the vibrations and electronic excitations.