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Título:
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Modeling Spin Transport in Helical Fields: Derivation of an Effective Low-Dimensional Hamiltonian
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Autores:
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Gutierrez, R. ;
Díaz García, Elena ;
Gaul, C. ;
Brumme, T. ;
Domínguez-Adame Acosta, Francisco ;
Cuniberti, G.
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Tipo de documento:
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texto impreso
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Editorial:
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Amer Chemical Soc, 2013-10-31
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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This study is devoted to a consistent derivation of an effective model Hamiltonian to describe spin transport along a helical pathway and in the presence of spin-orbit interaction, the latter being induced by an external field with helical symmetry. It is found that a sizable spin polarization of an unpolarized incoming state can be obtained without introducing phase breaking processes. For this, at least two energy levels per lattice site in the tight-binding representation are needed. Additionally, asymmetries in the effective electronic-coupling parameters as well as in the spin-orbit interaction strength must be present to achieve net polarization. For a fully symmetric system-in terms of electronic and spin-orbit couplings-no spin polarization is found. The model presented is quite general and is expected to be of interest for the treatment of spin-dependent effects in molecular scale systems with helical symmetry.
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En línea:
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https://eprints.ucm.es/id/eprint/31061/1/Dguez-Adame209postprint.pdf
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