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Gutierrez, R. and Díaz García, Elena and Gaul, C. and Brumme, T. and Domínguez-Adame Acosta, Francisco and Cuniberti, G. (2013) Modeling Spin Transport in Helical Fields: Derivation of an Effective Low-Dimensional Hamiltonian. Journal of physical chemistry C, 117 (43). pp. 22276-22284. ISSN 1932-7447
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Official URL: http://dx.doi.org/10.1021/jp401705x
Abstract
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.
Item Type: | Article |
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Additional Information: | © Amer Chemical Soc. |
Uncontrolled Keywords: | Self-assembled monolayers; Organized organic layers; Electron transmission; Magnetic- properties; Chiral molecules; Conduction; Dna |
Subjects: | Sciences > Physics > Materials Sciences > Physics > Solid state physics |
ID Code: | 31061 |
Deposited On: | 23 Jun 2015 16:11 |
Last Modified: | 23 Jun 2015 16:11 |
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