Geometry-induced spin-filtering in photoemission maps from WTe${}_2$ surface states

Abstract

We demonstrate that an important quantum material WTe${}_2$ exhibits a new type of geometry-induced spin-filtering effect in photoemission, stemming from low symmetry that is responsible for its exotic transport properties. Through the laser-driven spin-polarized angle-resolved photoemission Fermi surface mapping, we showcase highly asymmetric spin textures of electrons photoemitted from the surface states of WTe${}_2$. Such asymmetries are not present in the initial state spin textures, which are bound by the time-reversal and crystal lattice mirror plane symmetries. The findings are reproduced qualitatively by theoretical modeling within the one-step model photoemission formalism. The effect could be understood within the free-electron final state model as an interference due to emission from different atomic sites. The observed effect is a manifestation of time-reversal symmetry breaking of the initial state in the photoemission process, and as such it cannot be eliminated, but only its magnitude influenced, by special experimental geometries.

arXiv comment5 pages, 3 figures

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Cited by in corpus (3)

• Scattering makes a difference in circular dichroic angle-resolved photoemission
• Reexamining Circular Dichroism in Photoemission From a Topological Insulator
• Spin-orbital mixing in the topological ladder of the two-dimensional metal PtTe${}_2$