Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 43, Pages 22276-22284Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp401705x
Keywords
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Funding
- German Academic Exchange Service (DAAD) [54367888]
- Ministerio de Economa y Comptetitividad [MINECO-PRI-AIBDE-2011-0.927]
- International Max Planck Research School Dynamical Processes in Atoms, Molecules and Solids
- MINECO [MAT 2010-17180]
- PICATA postdoctoral fellowship from the Moncloa Campus of International Excellence (UCM-UPM)
- German Excellence Initiative via the Cluster of Excellence EXC 1056 Center for Advancing Electronics Dresden (cfAED)
- World Class University program
- Ministry of Education, Science and Technology through the National Research Foundation of Korea [R31-10100]
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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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