Spin polarization and spin separation realized in the double-helical molecules

Wu, Hong; Zhu, Yu-Lian; Sun, Xue; Gong, Wei‐Jiang

doi:10.1016/j.physe.2015.07.005

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…The effect is named CISS (chiral induced spin selectivity) and was initially reported in 1999 by Naaman and collaborators . Since then, a number of additional experimental − and theoretical − studies have been conducted. However, a theoretical consensus has not yet emerged.…”

Section: Theorymentioning

confidence: 99%

Theory of Chiral Induced Spin Selectivity

2019

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A general theory of the chiral induced spin selectivity (CISS) effect is presented. It is based on the fact that the spin–orbit (SO) coupling is small, a few meV, for the light atoms, which make up typical chiral molecules in experiments. We present a theorem based on the Onsager reciprocal principle, which states that the CISS effect vanishes when thermally averaging over all electron states. This zero result is avoided by the very nonthermal character of the incoming optically generated electrons in experimental realizations. Despite the small SO-coupling, the presence of accidental degeneracies in the molecular spectrum yields a sizable spin polarization. The CISS effect in the presence of magnetic leads is special. We prove that, in a situation with one magnetic lead, the other lead will become magnetized. This results from the interplay between the spin–orbit coupling in the chiral molecule and the magnetized lead. Numerical calculations for realistic chiral molecules confirm the theory.

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Section: Theorymentioning

confidence: 99%

Theory of Chiral Induced Spin Selectivity

2019

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“…Thus, the electronic state distribution relevant for electron tunneling through chiral molecules is voltage (and spin) dependent. This nonlinearity enables the measurements of spin-dependent transport measurements through molecules, even in two contact configurations. − …”

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confidence: 99%

Chiral Molecules and the Spin Selectivity Effect

Naaman

Paltiel

Waldeck

2020

J. Phys. Chem. Lett.

171

184

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This Perspective discusses recent experiments that bear on the chiral induced spin selectivity (CISS) mechanism and its manifestation in electronic and magnetic properties of chiral molecules and materials. Although the discussion emphasizes newer experiments, such as the magnetization dependence of chiral molecule interactions with ferromagnetic surfaces, early experiments, which reveal the nonlinear scaling of the spin filtering with applied potential, are described also. In many of the theoretical studies, one has had to invoke unusually large spin–orbit couplings in order to reproduce the large spin filtering observed in experiments. Experiments imply that exchange interactions and Pauli exclusion constraints are an important aspect of CISS. They also demonstrate the spin-dependent charge flow between a ferromagnetic substrate and chiral molecules. With these insights in mind, a simplified model is described in which the chiral molecule’s spin polarization is enhanced by a spin blockade effect to generate large spin filtering.

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“…As with experiments, there are different classes of theories. Some address the transport problem using the Büttiker Landauer approach. − Others are focused on the photoemission experiments . See Evers et al and references therein for a general review of the theory of CISS.…”

Section: Introductionmentioning

confidence: 99%

Chiral-Induced Spin Selectivity in Capacitively Coupled Molecules

Hedegård

2022

J. Phys. Chem. A

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The chiral-induced spin selectivity (CISS) effect is usually associated with electrons passing through chiral molecules. There are a number of experiments where external electrical fields rearrange electrons inside otherwise isolated molecules, allegedly also generating spin polarization of the molecule. There are theoretical suggestions of pairs of molecules generating spin polarizations in each other due to fluctuating electrical dipoles. This paper critically theoretically evaluates such spin-dependent charge reorganization (SDCR) effects. We find that such effects are not ruled out in principle, but they are very small and probably not detectable.

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Spin polarization and spin separation realized in the double-helical molecules

Cited by 6 publications

References 27 publications

Theory of Chiral Induced Spin Selectivity

Theory of Chiral Induced Spin Selectivity

Chiral Molecules and the Spin Selectivity Effect

Chiral-Induced Spin Selectivity in Capacitively Coupled Molecules

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