Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 104: Ultrafast Electron Dynamics III (joint session O/MA)

O 104.2: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, WIL B321

Spin-, time- and angle-resolved photoemission spectroscopy on WTe2 — •Mauro Fanciulli1,2, Jakub Schusser1,3, Christine Richter1,2, Cephise Cacho4, David Bresteau2, Thierry Ruchon2, Jan Minár3, and Karol Hricovini1,21LPMS, CY Cergy Paris Université, Cergy, FR — 2LIDYL, CEA Saclay, Gif-sur-Yvette, FR — 3NTC, University of West Bohemia, Pilsen, CZ — 4Diamond Light Source, Didcot, UK

We combined a spin-resolved photoemission spectrometer with a high-harmonic generation (HHG) laser source in order to perform spin-, time- and angle-resolved photoemission spectroscopy (STARPES) experiments on the transition metal dichalcogenide bulk WTe2, a possible Weyl type-II semimetal. Measurements at different femtosecond pump-probe delays and comparison with spin-resolved one-step photoemission calculations provide insight into the spin polarization of electrons above the Fermi level in the region where Weyl points of WTe2 are expected. We observe a spin accumulation above the Weyl points region, that is consistent with a spin-selective bottleneck effect due to the presence of spin polarized cone-like electronic structure. Our results support the feasibility of STARPES with HHG, which despite being experimentally challenging provides a unique way to study spin dynamics in photoemission.

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