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Spin-, time- and angle-resolved photoemission spectroscopy on WTe$_2$ by Fanciulli, Mauro; Schusser, Jakub; Lee, Min-I; Youbi, Zakariae El; Heckmann, Olivier; Richter, Maria Christine; Cacho, Cephise; Spezzani, Carlo; Bresteau, David; Hergott, Jean-François; D'Oliveira, Pascal; Tcherbakoff, Olivier; Ruchon, Thierry; Minár, Jan; Hricovini, Karol is a scholarly article available to read on EtoBox.

What is Spin-, time- and angle-resolved photoemission spectroscopy on WTe$_2$ about?

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 WTe$_2$, 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 WTe$_2$ 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.

Author

Fanciulli, Mauro; Schusser, Jakub; Lee, Min-I; Youbi, Zakariae El; Heckmann, Olivier; Richter, Maria Christine; Cacho, Cephise; Spezzani, Carlo; Bresteau, David; Hergott, Jean-François; D'Oliveira, Pascal; Tcherbakoff, Olivier; Ruchon, Thierry; Minár, Jan; Hricovini, Karol

Published

2019

Language

EN