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Cubic Rashba effect in the surface spin structure of rare-earth ternary materials

AuthorsUsachov, Dmitry Yu.; Nechaev, I. A.; Poelchen, Georg; Güttler, Monika; Krasovskii, E. E.; Schulz, Susanne; Generalov, Alexander; Kliemt, Kristin; Kraiker, A.; Krellner, Cornelius; Kummer, Kurt; Danzenbächer, Steffen; Laubschat, Clemens; Weber, A. P.; Sánchez-Barriga, J.; Chulkov, Eugene V. ; Santander-Syro, A. F.; Imai, T.; Miyamoto, Koji; Okuda, Taichi; Vyalikh, Denis V.
Issue Date2020
PublisherAmerican Physical Society
CitationPhysical Review Letters 124(23): 237202 (2020)
AbstractSpin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemission current from the Si-terminated surface of the antiferromagnet TbRh2Si2 and their analysis within an ab initio one-step theory unveil an unusual triple winding of the electron spin along the fourfold-symmetric constant energy contours of the surface states. A two-band k⋅p model is presented that yields the triple winding as a cubic Rashba effect. The curious in-plane spin-momentum locking is remarkably robust and remains intact across a paramagnetic-antiferromagnetic transition in spite of spin-orbit interaction on Rh atoms being considerably weaker than the out-of-plane exchange field due to the Tb 4f moments.
Publisher version (URL)https://doi.org/10.1103/PhysRevLett.124.237202
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