Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials.
Phys Rev Lett
; 124(23): 237202, 2020 Jun 12.
Article
en En
| MEDLINE
| ID: mdl-32603174
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 4f moments.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2020
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Article
País de afiliación:
Rusia