Publication: Spin dynamics in helical molecules with nonlinear interactions
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Publication Date
2018-04-27
Authors
Estévez, P. G.
Cerveró, J. M.
Gaul, C.
Díez, E.
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IOP Publishing
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Abstract
It is widely admitted that the helical conformation of certain chiral molecules may induce a sizable spin selectivity observed in experiments. Spin selectivity arises as a result of the interplay between a helicity-induced spin-orbit coupling (SOC) and electric dipole fields in the molecule. From the theoretical point of view, different phenomena might affect the spin dynamics in helical molecules, such as quantum dephasing, dissipation and the role of metallic contacts. With a few exceptions, previous studies usually neglect the local deformation of the molecule about the carrier, but this assumption seems unrealistic to describe charge transport in molecular systems. We introduce an effective model describing the electron spin dynamics in a deformable helical molecule with weak SOC. We find that the electron-lattice interaction allows the formation of stable solitons such as bright solitons with well defined spin projection onto the molecule axis. We present a thorough study of these bright solitons and analyze their possible impact on the spin dynamics in deformable helical molecules.
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© IOP Publishing.
The authors thank R Gutiérrez and V Mujica for helpful discussions. This research has been supported by MINECO (Grants MAT2013-46308 and MAT2016-75955) and Junta de Castilla y León (Grant SA045U16) and Junta de Castilla y León (Grant SA045U16) and P. Albares Ph.D. Fellowship.