Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: 2D Materials II: Transition Metal Dichalcogenides

O 53.2: Vortrag

Mittwoch, 3. April 2019, 10:45–11:00, H16

Angle, spin and time-resolved photoemission spectroscopy on WSe2 — •zakariae el youbi^{1, 2, 4}, jakub schüsser^{1, 3, 4}, mauro fanciulli^{1, 4}, waly ndiaye^{1, 4}, olivier heckmann^{1, 4}, marie-christine richter^{1, 4}, cephise cacho², and karol hricovini^{1, 4} — ¹LPMS, UCP, Cergy, France — ²Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK — ³Univ. of West Bohemia, Plzeň, Czech Republic — ⁴LIDYL-UMR 9222 CEA-CNRS

Tunable bandgap, high specific surface area, fabrication of van der Waals heterojunctions and other specific electronic properties make Transition Metal Dichalcogenides (TMDCs) very promising for the applications in photovoltaics and optoelectronics. In particular WSe2 which is of interest for valleytronic and spintronic device concepts. Here we report the characterization of cleaved WSe2 samples by angle resolved photoemission spectroscopy (ARPES). We measured the band structure of the valence band along Γ - K and Γ - M directions with Helium I and Helium II radiation and as well with ultrashort (< 20 fs) HHG laserlight. Ultrafast dynamics by pump-probe experiments (trARPES) and spin analysis in combination with circular polarised excitation will be discussed.