Abstract
Electron exchange and correlations emerging from the coupling between ionic vibrations and electrons are addressed. Spin-dependent electron-phonon coupling originates from the spin-orbit interaction, and it is shown that such electron-phonon coupling introduces exchange splitting between the spin channels in the structure. By application of these results to a model for a chiral molecular structure mounted between metallic leads, the chirality induced spin selectivity is found to become several tens of percents using experimentally feasible parameters.
Highlights
Chiral-induced spin selectivity is an intriguing phenomenon that, to our knowledge, rests on a foundation of structural chirality, spin-orbit interactions, and strongly nonequilibrium conditions
The effect is a measure of the response to changes in the magnetic environment coupled to the active region, and the phenomenology refers back to the experimental observations of substantial changes in the charge current amplitude through chiral molecules upon changes in the external magnetic conditions [1,2]
Using experimentally viable spin-orbit interaction parameters, it was shown that the exchange splitting between the spin channels that was introduced by the Coulomb interaction supports a chiral-induced spin selectivity of up to 10%
Summary
Chiral-induced spin selectivity is an intriguing phenomenon that, to our knowledge, rests on a foundation of structural chirality, spin-orbit interactions, and strongly nonequilibrium conditions. The results presented in this paper show that the cooperation of electron-phonon and spin-orbit interactions generates an exchange splitting between the spin channels which is viable for chiral-induced spin selectivity. To this end, a mechanism for spin-dependent electron-phonon coupling is introduced and discussed. This mechanism is applied to a model for a general lattice structure in which the emergence of a vibrationally induced spin splitting of the electron energies is stressed This result should open ways to address room temperature magnetism.
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