Chirality-Induced Spin-Selective Properties of Self-Assembled Monolayers of DNA on Gold

Ray, S. G.; Daube, Shirley S.; Leitus, Gregory; Vager, Z.; Naaman, Ron

doi:10.1103/physrevlett.96.036101

Cited by 112 publications

(118 citation statements)

References 32 publications

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“…Above we calculated TC for the model situation and obtained the formulas which should describe the experiments 2,4 . It is interesting to compare them with developed theory in which the parameter (11) is crucial.…”

Section: −Hmentioning

confidence: 99%

“…In recent years, it was discovered that electron transmission through ordered thin films of chiral molecules is highly spin selective [1][2][3][4][5] . This effect was termed as chiral-induced spin selectivity (CISS) effect 4 (for details see review 6 and Refs.…”

mentioning

confidence: 99%

“…therein). In experiments 2,4 , the transmission of photoelectrons through self-assembled monolayers (SAMs) of doublestranded DNA (dsDNA) on gold has been studied. The spin polarization (SP) of electrons ejected from Au substrate and transmitted through SAM of dsDNA was measured and the strong SP, which is defined as 4 P = (I ↑ − I ↓ )/(I ↑ + I ↓ ) was observed.…”

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confidence: 99%

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Spin sensitive electron transmission through helical potentials

Eremko

Локтев

2013

Phys. Rev. B

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We calculate the transmission coefficient for electrons passing through the helically shaped potential barrier which can be, for example, produced by DNA molecules. Introduction. In recent years, it was discovered that electron transmission through ordered thin films of chiral molecules is highly spin selective 1-5 . This effect was termed as chiral-induced spin selectivity (CISS) effect 4 (for details see review 6 and Refs. therein). In experiments 2,4 , the transmission of photoelectrons through self-assembled monolayers (SAMs) of doublestranded DNA (dsDNA) on gold has been studied. The spin polarization (SP) of electrons ejected from Au substrate and transmitted through SAM of dsDNA was measured and the strong SP, which is defined as 4 P = (I ↑ − I ↓ )/(I ↑ + I ↓ ) was observed. Here I ↑ and I ↓ are the intensities of the signals corresponding to the SP oriented parallel and antiparallel to the electrons' velocity, respectively.Recently, different models have been proposed 7-10 to explain experimental results. A scattering theory in the first Born approximation has been applied to obtain the SP in the differential cross section of electrons moving through chiral molecules with energies above the vacuum level 8 . The model of point charges placed along a helical line is considered in a tight binding approximation for electronic structure of the helix and the transmission of distinct electron spin state is computed by the Landauer formulation 9 . The SP conductance through a metal-DNA-metal structure is calculated in a tight binding picture 10 . Although all these studies differ in details, they possess similar physical basis. Each of them is based on accounting of the spin-orbit interaction (SOI) of an electron that is moving through a helical potential. In other words, describing different aspects of the problem, approaches are based on the Schrödinger equation 11

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Section: −Hmentioning

confidence: 99%

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Spin sensitive electron transmission through helical potentials

Eremko

Локтев

2013

Phys. Rev. B

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“…Interfacial magnetization in the organic molecules may also be induced [48] and the surface magnetic anisotropy of the ferromagnetic metal be modified [49]. Even more intriguing, induced magnetization on the surfaces of nonmagnetic metals through decoration of organic selfassembled monolayers (SAMs) [46,50] has been demonstrated, which parallels another hot topic in the electric-field creation of magnetism in nonmagnetic metals [51]. In this review article, we focus on the recent developments on the control of magnetism in DMS (Ga,Mn)As films by taking advantages of the diverse functionalities of organic molecules.…”

Section: Introductionmentioning

confidence: 99%

Control of Magnetism in Dilute Magnetic Semiconductor (Ga,Mn)As Films by Surface Decoration of Molecules

Wang

Xiong

et al. 2016

Front. Phys.

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The responses of magnetic moments to external stimuli such as magnetic-field, heat, light, and electric-field have been utilized to manipulate the magnetism in magnetic semiconductors, with many of the novel ideas applied even to ferromagnetic metals. Here, we review a new experimental development on the control of magnetism in (Ga,Mn)As thin films by surface decoration of organic molecules: Molecules deposited on the surface of (Ga,Mn)As thin films are shown to be capable of significantly modulating their saturation magnetization and Curie temperature. These phenomena are shown to originate from the carrier-mediated ferromagnetism in (Ga,Mn)As and the surface molecules acting as acceptors or donors depending on their highest occupied molecular orbitals, resembling the charge transfer mechanism in a pn junction in which the equilibrium state is reached on the alignment of Fermi levels.

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“…Hence, the recent experimental demonstration 6,7 of spin selective effects in monolayers of double-stranded DNA oligomers as well as earlier works [8][9][10][11][12][13][14][15] have triggered strong interest.…”

Section: Introductionmentioning

confidence: 99%

Modeling Spin Transport in Helical Fields: Derivation of an Effective Low-Dimensional Hamiltonian

et al. 2013

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This study is devoted to a consistent derivation of an effective model Hamiltonian to describe spin transport along a helical pathway and in presence of spin-orbit interaction, the latter being induced by an external field with helical symmetry. It is found that a sizeable spin polarization of an unpolarized incoming state can be obtained without introducing phase breaking processes. For this, at least two energy levels per lattice site in the tight-binding representation are needed. Additionally, asymmetries in the effective electronic-coupling parameters as well as in the spin-orbit interaction strength must be present to achieve net polarization. For a fully symmetric system -in terms of electronic and spin-orbit couplings-no spin polarization is found. The model presented is quite general and is expected to be of interest for the treatment of spindependent effects in molecular scale systems with helical symmetry.

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Chirality-Induced Spin-Selective Properties of Self-Assembled Monolayers of DNA on Gold

Cited by 112 publications

References 32 publications

Spin sensitive electron transmission through helical potentials

Spin sensitive electron transmission through helical potentials

Control of Magnetism in Dilute Magnetic Semiconductor (Ga,Mn)As Films by Surface Decoration of Molecules

Modeling Spin Transport in Helical Fields: Derivation of an Effective Low-Dimensional Hamiltonian

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