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Cubic Rashba effect in the surface spin structure of rare-earth ternary materials
Physical Review Letters ( IF 9.227 ) Pub Date : 
D. Yu. Usachov; I. A. Nechaev; G. Poelchen; M. Güttler; E. E. Krasovskii; S. Schulz; A. Generalov; K. Kliemt; A. Kraiker; C. Krellner; K. Kummer; S. Danzenbächer; C. Laubschat; A. P. Weber; J. Sánchez-Barriga; E. V. Chulkov; A. F. Santander-Syro; T. Imai; K. Miyamoto; T. Okuda; D. V. Vyalikh

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 TbRh2Si2 and their analysis within an {} 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.
更新日期:2020-05-29

 

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