Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 92: Postersession DS/HL
HL 92.12: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Magnetic-field dependent photoluminescence measurements of WS2 monolayers — •Jan Kuhnert, Simon Schmitt, Arash Rahimi-Iman, Ajanth Velauthapillai, and Wolfram Heimbrodt — Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany
Layered transition-metal dichalcogenides have attracted great interest in the last few years. Thinned down to monolayers they exhibit outstanding optical properties caused by the direct band gap. Here we present photoluminescence measurements of tungsten disulfide monolayers at low temperatures (2 K) in the presence of an external magnetic field in Faraday geometry. In the monolayer limit the inversion symmetry is broken and spin and valley are coupled. The degeneracy between the two equivalent K and K’ valleys is broken by applying external magnetic fields. This causes a Zeeman shift which has already been shown in similar layered transition-metal dichalcogenides (eg. MoSe2: 0,25 meV/T (1)). We show this field-dependent Zeeman splitting in tungsten disulfide at low temperatures (2 K) and find a surprisingly large splitting of 0,8 meV/T.
(1) Nature Physics 11, 141147 (2015)