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Coherent spin dynamics in a helical arrangement of molecular dipoles

1 GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain
2 Institute for Materials Science, Dresden University of Technology, 01062 Dresden, Germany
3 Cognitec Systems GmbH, Großenhainer Str. 101, 01127 Dresden, Germany
4 Dresden Center for Computational Materials Science (DCMS), TU Dresden, 01062 Dresden, Germany
5 Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany

Special Issue: Organic and Molecular Spintronics

Experiments on electron transport through helical molecules have demonstrated theappearance of high spin selectivity, in spite of the rather weak spin-orbit coupling in organiccompounds. Theoretical models usually rely on different mechanisms to explain these experiments,such as large spin-orbit coupling, quantum dephasing, the role of metallic contacts, or the interplaybetween a helicity-induced spin-orbit coupling and a strong dipole electric field. In this work weconsider the coherent electron dynamics in the electric field created by the helical arrangement ofdipoles of the molecule backbone, giving rise to an effective spin-orbit coupling. We calculate the spinprojection onto the helical axis as a figure of merit for the assessment of the spin dynamics in a verylong helical molecule. We prove that the spin projection reaches a steady state regime after a shorttransient. We compare its asymptotic value for different initial conditions, aiming to better understandthe origin of the spin selectivity found in experiments.
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Keywords spin polarized transport; helical molecules; spin sensitivity; nanoscale materials; spin-orbit coupling

Citation: Elena Díaz, Rafael Gutiérrez, Christopher Gaul, Gianaurelio Cuniberti, Francisco Domínguez-Adame. Coherent spin dynamics in a helical arrangement of molecular dipoles. AIMS Materials Science, 2017, 4(5): 1052-1061. doi: 10.3934/matersci.2017.5.1052


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This article has been cited by

  • 1. P. Albares, E. Díaz, Jose M. Cerveró, F. Domínguez-Adame, E. Diez, P. G. Estévez, Solitons in a nonlinear model of spin transport in helical molecules, Physical Review E, 2018, 97, 2, 10.1103/PhysRevE.97.022210

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