Contact effects in spin transport along double-helical molecules
Guo AM, Diaz E, Gaul C, Gutierrez R, Dominguez-Adame F, Cuniberti G, Sun QF (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 89
Article Number: 205434
Journal Issue: 20
DOI: 10.1103/PhysRevB.89.205434
Abstract
We report on spin transport along double-helical molecular systems by considering various contact configurations and asymmetries between the two helical strands in the regime of completely coherent charge transport. Our results reveal that no spin polarization appears in two-terminal molecular devices when coupled to one-dimensional electrodes. The same holds in the case of finite-width electrodes if there is a bottleneck of one single site in the system electrode-molecule-electrode. Then, additional dephasing is necessary to induce spin-filtering effects. In contrast, nonzero spin polarization is found in molecular devices with multiple terminals or with two finite-width electrodes, each of them connected to more than one site of the molecule. The magnitude of spin polarization can be enhanced by increasing the asymmetry between the two strands. We point out that the spin-filtering effects could emerge in double-helical molecular devices at low temperature without dephasing by a proper choice of the electrode number and the connection between the molecule and the electrodes. © 2014 American Physical Society.
Involved external institutions
Chinese Academy of Sciences (CAS) / 中国科学院
China (CN)
Universidad Complutense de Madrid (UCM)
Spain (ES)
Max-Planck-Institut für Physik komplexer Systeme (MPI PKS) / Max Planck Institute for the Physics of Complex Systems
Germany (DE)
Technische Universität Dresden
Germany (DE)
Peking University (PKU) / 北京大学
China (CN)
China (CN)
Universidad Complutense de Madrid (UCM)
Spain (ES)
Max-Planck-Institut für Physik komplexer Systeme (MPI PKS) / Max Planck Institute for the Physics of Complex Systems
Germany (DE)
Technische Universität Dresden
Germany (DE)
Peking University (PKU) / 北京大学
China (CN)
How to cite
APA:
Guo, A.-M., Diaz, E., Gaul, C., Gutierrez, R., Dominguez-Adame, F., Cuniberti, G., & Sun, Q.-F. (2014). Contact effects in spin transport along double-helical molecules. Physical Review B - Condensed Matter and Materials Physics, 89(20). https://dx.doi.org/10.1103/PhysRevB.89.205434
MLA:
Guo, Ai-Min, et al. "Contact effects in spin transport along double-helical molecules." Physical Review B - Condensed Matter and Materials Physics 89.20 (2014).
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