Spin-, time- and angle-resolved photoemission spectroscopy on WTe${}_2$

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.

arXiv comment6 pages, 4 figures

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Cited by in corpus (8)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser
• Ultrafast Hidden Spin Polarization Dynamics of Bright and Dark Excitons in 2H-WSe${}_2$
• Surface band characters of Weyl semimetal candidate material MoTe${}_2$ revealed by one-step ARPES theory
• Reversible canted persistent spin textures with large spin splitting in two-dimensional ferroelectric bilayer WTe${}_2$
• In situ sub-50 attosecond active stabilization of the delay between infrared and extreme ultraviolet light pulses
• Geometry-induced spin-filtering in photoemission maps from WTe${}_2$ surface states