Chiral-induced spin selectivity: A polaron transport model

Zhang, Longlong; Hao, Yuying; Qin, Wei; Xie, Shijie; Qu, Fanyao

doi:10.1103/physrevb.102.214303

Cited by 76 publications

(70 citation statements)

References 38 publications

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“…Any change in the structure/damage in DNA is reflected in the change in peak positions or intensity in FT-IR spectra and has been verified experimentally as reported in the literature previously [38][39][40][41][42]. Very recently, it has been demonstrated theoretically that vibration enhances the electronic coherent effect, and spin-dependent electron-phonon coupling brings more tunneling paths in the ds-DNA molecules promoting CISS-induced polarization [43][44][45][46][47]. The change in the vibration mode could be one of the reasons for the reduction in the spin-polarized electrons transported through DNA.…”

Section: Resultssupporting

confidence: 55%

Radiation-Induced Effect on Spin-Selective Electron Transfer through Self-Assembled Monolayers of ds-DNA

2021

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Stability of the DNA molecule is essential for the proper functioning and sustainability of all living organisms. In this study, we investigate the effect of gamma radiation (γ-radiation) on spin-selective electron transfer through double strand (ds)DNA molecules. Self-assembled monolayers (SAMs) of 21-base long DNA are prepared on Au-coated Ni thin film. We measure the spin polarization (%) of the SAMs of ds-DNA using the spin-dependent electrochemical technique. We use a Cs-based γ-radiation source to expose the SAMs of ds-DNA immobilized on thin films for various time intervals ranging from 0–30 min. The susceptibility of DNA to γ-radiation is measured by spin-dependent electrochemistry. We observe that the efficiency of spin filtering by ds-DNA gradually decreases when exposure (to γ-radiation) time increases, and drops below 1% after 30 min of exposure. The change in spin polarization value is related either to the conformational perturbation in DNA or to structural damage in DNA molecules caused by ionizing radiation.

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Section: Resultssupporting

confidence: 55%

Radiation-Induced Effect on Spin-Selective Electron Transfer through Self-Assembled Monolayers of ds-DNA

2021

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“…In particular, he investigated systems of chiral molecules coupled to metals, where molecular vibrations (phonons) represent a mechanism able to break the spin symmetry of the molecule (Fransson, 2021). On their side, Zhang et al assessed spin polaron transport in chiral molecules and, unlike previous theoretical explanations, their results showed that both type of polarons (spin-up and spindown) can traverse the chiral molecule, although with different spin dynamics, i.e., the ones with antiparallel orientation experiment spin switching (Zhang et al, 2020).…”

Section: Theoretical Modelsmentioning

confidence: 99%

The Importance of Spin State in Chiral Supramolecular Electronics

2021

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The field of spintronics explores how magnetic fields can influence the properties of organic and inorganic materials by controlling their electron’s spins. In this sense, organic materials are very attractive since they have small spin-orbit coupling, allowing long-range spin-coherence over times and distances longer than in conventional metals or semiconductors. Usually, the small spin-orbit coupling means that organic materials cannot be used for spin injection, requiring ferromagnetic electrodes. However, chiral molecules have been demonstrated to behave as spin filters upon light illumination in the phenomenon described as chirality-induced spin selectivity (CISS) effect. This means that electrons of certain spin can go through chiral assemblies of molecules preferentially in one direction depending on their handedness. This is possible because the lack of inversion symmetry in chiral molecules couples with the electron’s spin and its linear momentum so the molecules transmit the one preferred spin. In this respect, chiral semiconductors have great potential in the field of organic electronics since when charge carriers are created, a preferred spin could be transmitted through a determined handedness structure. The exploration of the CISS effect in chiral supramolecular semiconductors could add greatly to the efforts made by the organic electronics community since charge recombination could be diminished and charge transport improved when the spins are preferentially guided in one specific direction. This review outlines the advances in supramolecular chiral semiconductors regarding their spin state and its influence on the final electronic properties.

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“…Experimental findings which suggest the mechanism of the spin selectivity in helical organic molecules are as follows: (a) the spin selectivity reverses its sign with changing chirality [8][9][10][11], (b) it increases with the number of monomers in the organic molecule [4,5,7,12] and decreases by compression along the length via the applied force [19], and (c) its magnitude depends strongly on the monomer type, that is, whether it is a base [in single-stranded DNA (ssDNA)] [3,4] or amino acid (in oligopeptide) [7,9]. A number of calculations [20][21][22][23][24][25][26][27][28][29][30][31][32] have been made on transport through a single model molecule consisting of sites, each of which has a single orbital. Each site in the model represents each monomer of helical organic molecules [21,22,[24][25][26][27][28][29][30][31][32], each atom of helicene [23], or each site in an effective tight-binding model [20].…”

Section: Introductionmentioning

confidence: 99%

“…A number of calculations [20][21][22][23][24][25][26][27][28][29][30][31][32] have been made on transport through a single model molecule consisting of sites, each of which has a single orbital. Each site in the model represents each monomer of helical organic molecules [21,22,[24][25][26][27][28][29][30][31][32], each atom of helicene [23], or each site in an effective tight-binding model [20]. Since the SOI cannot be expressed by a single orbital within one site, it is incorporated in hopping integrals between sites in the model Hamiltonian.…”

Section: Introductionmentioning

confidence: 99%

Orbital and spin polarizations induced by current through a helical atomic chain

2021

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Current-induced spin and orbital polarizations are theoretically studied in a helical atomic chain with p x , p y , and p z orbitals in each atom in the linear response to the chemical-potential difference between source and drain electrodes. It is shown that these polarizations are parallel to the helix axis and proportional to the curvature of the cylinder surface defined by the helix in the small curvature region. This proportionality suggests that the curvature generates the coupling between the current and the atomic orbital angular momentum and therefore influences the magnitude of induced spin polarization through the LS coupling. It is also found that current-induced polarizations are nonzero even when the pitch is enforced to vanish. This suggests the possibility that nonchiral structures with curvature can produce current-induced polarizations. With this possibility in mind, it is proposed that the chirality in the current, rather than that in the structure, determines the existence of such current-induced polarizations.

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Chiral-induced spin selectivity: A polaron transport model

Cited by 76 publications

References 38 publications

Radiation-Induced Effect on Spin-Selective Electron Transfer through Self-Assembled Monolayers of ds-DNA

Radiation-Induced Effect on Spin-Selective Electron Transfer through Self-Assembled Monolayers of ds-DNA

The Importance of Spin State in Chiral Supramolecular Electronics

Orbital and spin polarizations induced by current through a helical atomic chain

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