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Open Access Spin-orbit Coupling Modulation in DNA by Mechanical Deformations

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We consider molecular straining as a probe to understand the mobility and spin active features of complex molecules. The strength of the spin-orbit interaction relevant to transport in a low dimensional structure depends critically on the relative geometrical arrangement of current-carrying orbitals. Understanding the origin of the enhanced spin-orbit interaction in chiral systems is crucial to be able to control the spin selectivity observed in the experiments, which is a hallmark of the Chiral-Induced Selectivity Effect (CISS). Recent tight-binding orbital models for spin transport in DNA-like molecules, have surmised that the band spin-orbit (SO) coupling arises from the particular angular relations between orbitals of neighboring bases on the helical chain. Such arrangements could be probed by straining the molecule in a conductive probe AFM/Break junction type setup, as was recently reported by Kiran, Cohen and Naaman. Here we report strain-dependent kinetic and SO coupling when a double-strand DNA model is compressed or stretched in two experimentally feasible setups with peculiar deformation properties. We find that the mobility and the SO coupling can be tuned appreciably by strain, and the analytical model bears out the qualitative trends of the experiments.

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Keywords: CHIRAL-INDUCED SELECTIVITY EFFECT (CISS); DNA; SPIN-ORBIT COUPLING

Document Type: Research Article

Affiliations: 1: Yachay Tech, School of Chemical Sciences & Engineering, 100119-Urcuquí, Ecuador, Escuela de Física, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela 2: School of Molecular Sciences, Arizona State University, Tempe, Arizona, 85287, USA;, Email: [email protected] 3: Yachay Tech, School of Physical Sciences & Nanotechnology, 100119-Urcuquí, Ecuador, Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), Apartado 21827, Caracas 1020 A, Venezuela;, Email: [email protected]

Publication date: June 1, 2018

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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