Vibrationally-mediated Dzyaloshinskii-Moriya interaction as the origin of Chirality-Induced Spin Selectivity in donor-acceptor molecules
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910101004091392 |
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| author | Chiesa, Alessandro Huu, D. K. Andrea Phan Cantarella, Arianna Celada, Leonardo Wasielewski, Michael R. Santini, Paolo Carretta, Stefano |
| author_facet | Chiesa, Alessandro Huu, D. K. Andrea Phan Cantarella, Arianna Celada, Leonardo Wasielewski, Michael R. Santini, Paolo Carretta, Stefano |
| contents | Chirality-induced spin selectivity (CISS) was recently observed in photo-excited donor-chiral bridge-acceptor molecules, but a predictive theory able to explain available experiments is still lacking. Here we show that low-energy torsional modes modulating hopping and spin-orbit coupling give rise to a Dzyaloshinskii-Moriya interaction between the transferred electron and the one sitting on the donor, producing high spin polarization for perfectly realistic parameters. Our model introduces a low energy scale in the spin dynamics which explains the magnetic field dependence observed in EPR measurements and predicts a non-trivial temperature dependence, as demonstrated by numerical simulations. The present theory lays the foundations for future test-bed experiments and for the design of applications in spintronics and quantum technologies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_03210 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Vibrationally-mediated Dzyaloshinskii-Moriya interaction as the origin of Chirality-Induced Spin Selectivity in donor-acceptor molecules Chiesa, Alessandro Huu, D. K. Andrea Phan Cantarella, Arianna Celada, Leonardo Wasielewski, Michael R. Santini, Paolo Carretta, Stefano Mesoscale and Nanoscale Physics Chirality-induced spin selectivity (CISS) was recently observed in photo-excited donor-chiral bridge-acceptor molecules, but a predictive theory able to explain available experiments is still lacking. Here we show that low-energy torsional modes modulating hopping and spin-orbit coupling give rise to a Dzyaloshinskii-Moriya interaction between the transferred electron and the one sitting on the donor, producing high spin polarization for perfectly realistic parameters. Our model introduces a low energy scale in the spin dynamics which explains the magnetic field dependence observed in EPR measurements and predicts a non-trivial temperature dependence, as demonstrated by numerical simulations. The present theory lays the foundations for future test-bed experiments and for the design of applications in spintronics and quantum technologies. |
| title | Vibrationally-mediated Dzyaloshinskii-Moriya interaction as the origin of Chirality-Induced Spin Selectivity in donor-acceptor molecules |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.03210 |