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

DOI: 10.1103/PhysRevLett.124.237202 DOI Help

Authors: D. Y. Usachov (St. Petersburg State University) , I. A. Nechaev (FCT-ZTF, UPV-EHU) , G. Poelchen (Technische Universität Dresden) , M. Guttler (Dresden University of Technology) , E. E. Krasovskii (Donostia International Physics Center (DIPC); UPV/EHU; IKERBASQUE, Basque Foundation for Science) , S. Schulz (TU Dresden) , A. Generalov (Lund University) , K. Kliemt (Goethe-Universität Frankfurt) , A. Kraiker (Goethe-Universität Frankfurt) , C. Krellner (Goethe-Universität Frankfurt) , K. Kummer (European Synchrotron Radiation Facility (ESRF)) , S. Danzenbächer (Technische Universität Dresden) , C. Laubschat (Technische Universität Dresden) , A. P. Weber (Donostia International Physics Center (DIPC)) , J. Sánchez-barriga (Elektronenspeicherring BESSY II) , E. V. Chulkov (St. Petersburg State University; Donostia International Physics Center (DIPC); UPV/EHU; CFM-MPC; CSIC-UPV/EHU; Tomsk State University) , A. F. Santander-syro (Université Paris-Saclay, CNRS) , T. Imai (Hiroshima University) , K. Miyamoto (Hiroshima Synchrotron Radiation Center, Hiroshima University) , T. Okuda (Hiroshima Synchrotron Radiation Center, Hiroshima University) , D. V. Vyalikh (Donostia International Physics Center (DIPC); IKERBASQUE, Basque Foundation for Science)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 124

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 18844 , 17761

Abstract: Spin-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 TbRh 2 Si 2 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 4 f moments.

Journal Keywords: Electronic structure; Magnetic texture; Magnetism

Subject Areas: Materials, Physics

Instruments: I05-ARPES