Artículo
Spin polarization in the Hubbard model with Rashba spin-orbit coupling on a ladder
Fecha de publicación:
07/2013
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The competition between on-site Coulomb repulsion and Rashba spin-orbit coupling (RSOC) is studied on two-leg ladders by numerical techniques. By studying persistent currents in closed rings by exact diagonalization, it is found that the contribution to the current due to the RSOC VSO, for a fixed value of the Hubbard repulsion U reaches a maximum at intermediate values of VSO. By increasing the repulsive Hubbard coupling U, this spin-flipping current is suppressed and eventually it becomes opposite to the spin-conserving current. The main result is that the spin accumulation defined as the relative spin polarization between the two legs of the ladder is enhanced by U. Similar results for this Hubbard-Rashba model are observed for a completely different setup in which two halves of the ladders are connected to a voltage bias and the ensuing time-dependent regime is studied by the density matrix renormalization group technique. The combined effect between VSO and U is also interesting, leading to a strong enhancement of antiferromagnetic order, which in turn may explain the observed behavior of the spin-flipping current. The implications of this enhancement of the spin-Hall effect with electron correlations for spintronic devices is discussed.
Palabras clave:
Rashba
,
Hubbard
,
Spin-Hall
,
Espintronica
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Identificadores
Colecciones
Articulos(CCT - ROSARIO)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - ROSARIO
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - ROSARIO
Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos de INST.DE FISICA DE ROSARIO (I)
Citación
Riera, Jose Alejandro; Spin polarization in the Hubbard model with Rashba spin-orbit coupling on a ladder; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 88; 4; 7-2013; 45102-45102
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