1. Spin, time, and angle resolved photoemission spectroscopy on WTe2
- Author
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Karol Hricovini, Min-I Lee, David Bresteau, J.-F. Hergott, Zakariae El Youbi, Jakub Schusser, O. Heckmann, Jan Minár, Cephise Cacho, O. Tcherbakoff, Carlo Spezzani, Thierry Ruchon, Mauro Fanciulli, Maria Christine Richter, P. d’Oliveira, Laboratoire de Physique des Matériaux et des Surfaces (LPMS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CY Cergy Paris Université (CY), Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), University of West Bohemia [Plzeň ], DIAMOND Light source, Elettra Sincrotrone Trieste, Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Serveurs Laser (SLIC), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Electronic structure ,Materials science ,FOS: Physical sciences ,Angle-resolved photoemission spectroscopy ,02 engineering and technology ,7. Clean energy ,01 natural sciences ,Korringa-Kohn- Rostoker method ,Time & angle-resolved photoemission spectroscopy ,Transition metal ,0103 physical sciences ,010306 general physics ,Spin-½ ,[PHYS]Physics [physics] ,Condensed Matter - Materials Science ,Condensed matter physics ,Spin polarization ,Topological classification ,Materials Science (cond-mat.mtrl-sci) ,Transition-metal dichalcogenide ,021001 nanoscience & nanotechnology ,Spin-resolved photoemission spectroscopy ,Pulse (physics) ,High-harmonic generation ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology ,Weyl semimetal - Abstract
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., 6 pages, 4 figures
- Published
- 2020
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