Publication: Spin-selective transport through helical molecular systems
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2012-02-16
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American Physical Society
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Abstract
Highly spin-selective transport of electrons through a helically shaped electrostatic potential is demonstrated in the frame of a minimal model approach. The effect is significant even for weak spin-orbit coupling. Two main factors determine the selectivity: an unconventional Rashba-like spin-orbit interaction, reflecting the helical symmetry of the system, and a weakly dispersive electronic band of the helical system. The weak electronic coupling, associated with the small dispersion, leads to a low mobility of the charges in the system and allows even weak spin-orbit interactions to be effective. The results are expected to be generic for chiral molecular systems displaying low spin-orbit coupling and low conductivity.
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©2012 American Physical Society.
R.G. and E.D. thank H. Pastawski, R. Bustos-Marun, T. Brumme, and S. Avdoshenko for fruitful discussions. This work was partially funded by the DFG under CU 44/20-1, MAT2010-17180, and by the South Korea Ministry of Education, Science, and Technology Program “World Class University” (No. R31-2008-000-10100-0). Computational resources were provided by the ZIH at TU-Dresden. E.D. thanks Ministerio de Educacion y Ciencia (MEC) and R.N. thanks the German-Israel Science Foundation and the Israel Science Foundation for financial support. Travel between Dresden and Madrid was supported by the Ministerio de Economia y Comptetitividad (project PRI-AIBDE-2011- 0927) and by the German Academic Exchange Service (project 54367888) within the joint program Acciones Integradas.