• Open Access

Spin, time, and angle resolved photoemission spectroscopy on WTe2

Mauro Fanciulli, Jakub Schusser, Min-I Lee, Zakariae El Youbi, Olivier Heckmann, Maria Christine Richter, Cephise Cacho, Carlo Spezzani, David Bresteau, Jean-François Hergott, Pascal D'Oliveira, Olivier Tcherbakoff, Thierry Ruchon, Jan Minár, and Karol Hricovini
Phys. Rev. Research 2, 013261 – Published 5 March 2020
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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 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, which is consistent with a spin-selective bottleneck effect due to the presence of spin-polarized conelike 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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  • Received 25 November 2019
  • Accepted 29 January 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.013261

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mauro Fanciulli1,2,*, Jakub Schusser1,2,3, Min-I Lee1,2, Zakariae El Youbi1,2,4, Olivier Heckmann1,2, Maria Christine Richter1,2, Cephise Cacho4, Carlo Spezzani5, David Bresteau2, Jean-François Hergott2, Pascal D'Oliveira2, Olivier Tcherbakoff2, Thierry Ruchon2, Jan Minár3, and Karol Hricovini1,2

  • 1Laboratoire de Physique des Matériaux et Surfaces, CY Cergy Paris Université, 95031 Cergy-Pontoise, France
  • 2Université Paris-Saclay, CEA, CNRS, LIDYL, 91191 Gif-sur-Yvette, France
  • 3New Technologies-Research Center, University of West Bohemia, 30614 Pilsen, Czech Republic
  • 4Diamond Light Source, Harwell Campus, OX110DE Didcot, United Kingdom
  • 5Elettra-Sincrotrone Trieste, 34149 Basovizza, Italy

  • *Corresponding author: mauro.fanciulli@u-cergy.fr

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Vol. 2, Iss. 1 — March - May 2020

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