Current-induced spin polarization in graphene due to Rashba spin-orbit interaction

Dyrdał, A.; Barnaś, J.; Dugaev, V. K.

doi:10.1103/physrevb.89.075422

Cited by 31 publications

(44 citation statements)

References 28 publications

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“…For long relaxation times we get the same analytical formulas as those in the case of nonmagnetic graphene, 33 i.e.,…”

Section: Current-induced Spin Polarizationmentioning

confidence: 76%

“…Moreover, sign of the spinpolarization depends on the chemical potential and also on the sign of the Rashba spin-orbit coupling parameter. 33 When the Fermi level passes through the Dirac points, the spin polarization becomes reversed. In this paper we show that the current-induced spin polarization in magnetic graphene has generally all three components.…”

Section: Introductionmentioning

confidence: 99%

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Current-induced spin polarization and spin-orbit torque in graphene

Dyrdał

Barnaś

2015

Phys. Rev. B

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Using the Green function formalism we calculate a current-induced spin polarization of weakly magnetized graphene with Rashba spin-orbit interaction. In a general case, all components of the current-induced spin polarization are nonzero, contrary to the nonmagnetic limit, where the only nonvanishing component of spin polarization is that in the graphene plane and normal to electric field. When the induced spin polarization is exchange-coupled to the magnetization, it exerts a spin-orbit torque on the latter. Using the Green function method we have derived some analytical formulas for the spin polarization and also determined the corresponding spin-orbit torque components. The analytical results are compared with those obtained numerically. Vertex corrections due to scattering on randomly distributed impurities is also calculated and shown to enhance the spin polarization calculated in the bare bubble approximation.

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“…For long relaxation times we get the same analytical formulas as those in the case of nonmagnetic graphene, 33 i.e.,…”

Section: Current-induced Spin Polarizationmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Current-induced spin polarization and spin-orbit torque in graphene

Dyrdał

Barnaś

2015

Phys. Rev. B

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“…45 A nonzero spin polarization S y appears due to the imbalance of the distribution of electrons with k x > 0 and k x < 0. 41 …”

Section: A Spin Polarizationmentioning

confidence: 99%

“…Similarly, the spin polarization may be induced by the electric field as well. 41 In section 2 we describe the theoretical model. Numerical results on the thermally induced charge and heat currents are presented and discussed in section 3.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric and thermospin transport in a ballistic junction of graphene

Inglot¹,

Dugaev

Barnaś

2015

Phys. Rev. B

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We consider theoretically a wide graphene ribbon, that on both ends is attached to electronic reservoirs which generally have different temperatures. The graphene ribbon is assumed to be deposited on a substrate, that leads to a spin-orbit coupling of Rashba type. We calculate the thermally induced charge current in the ballistic transport regime as well as the thermoelectric voltage (Seebeck effect). Apart from this, we also consider thermally induced spin current and spin polarization of the graphene ribbon. The spin currents are shown to have generally two components; one parallel to the temperature gradient and the other one perpendicular to this gradient. The latter corresponds to the spin current due to the spin Nernst effect. Additionally, we also consider the heat current between the reservoirs due to transfer of electrons.

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“…The extrinsic or Rashba SOC, however, results from the lack of inversion symmetry due to perpendicular electric fields, substrate effects, chemical doping, or curvature of graphene corrugations and can be responsible for inducing a spin polarization in graphene. [9,10] The influences of intrinsic and Rashba SOCs on the transport properties of graphene monolayer systems have extensively been studied in the recent years [5,6,[11][12][13][14]. For instance, it was shown that spin polarization induced by a charge current can reside in the graphene plane and perpendicular to the electric field while its sign changes by varying the Fermi level through an external gate voltage [11].…”

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confidence: 99%

Strain-controlled spin and charge pumping in graphene devices via spin-orbit coupled barriers

Mohammadkhani¹,

Abdollahipour²,

Alidoust³

2015

EPL

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-We theoretically propose a graphene-based adiabatic quantum pump with intrinsic spin-orbit coupling (SOC) subject to strain where two time-dependent extrinsic spin-orbit coupled barriers drive spin and charge currents. We study three differing operation modes where i) location, ii) chemical potential, and iii) SOC of the two barriers oscillate periodically and out of phase around their equilibrium states. Our results demonstrate that the amplitude of adiabatically pumped currents highly depends on the considered operation mode. We find that such a device operates with highest efficiency and in a broader range of parameters where the barriers' chemical potential drives the quantum pump. Our results also reveal that by introducing strain to the system, one can suppress or enhance the charge and spin currents separately, depending on strain direction.Spintronics is an emerging filed which has aimed at exploiting the spin degree of freedom to construct faster and high performance low-power nanoscale devices [1]. The discovery of isolated graphene monolayer [2,3], a single layer of Carbon atoms, with unique electrical, optical and thermal properties has triggered numerous efforts to achieve graphene-based nanoscale devices [5][6][7][8]. The massless Dirac fermions in ballistic graphene can reflect chirality and linear dispersion relation of graphene around the Dirac points; two inequivalent corners of the first Brillouin zone [4]. Also, the long spin relaxation time of the Dirac fermions in graphene monolayers due to a small intrinsic spin-orbit coupling (SOC) which originates from the intra-atomic spin-orbit coupling of the Carbon atoms has made it an exceptional candidate to the spintronics devices [7].Quite recently, it was experimentally demonstrated that a strong Rashba SOC ∼ 17 meV can be induced into graphene monolayers by means of proximity to a semiconducting tungsten disulphide substrate [8]. This finding is highly appealing in terms of generation and manipulation of spin currents in more controllable platforms. The intrinsic SOC that can be caused by the crystalline potential associated with the band structure respects all the lattice symmetries in graphene and results in a small energy gap at the Dirac points. The extrinsic or Rashba SOC, however, results from the lack of inversion symmetry due to perpendicular electric fields, substrate effects, chemical doping, or curvature of graphene corrugations and can be responsible for inducing a spin polarization in graphene. [9,10] The influences of intrinsic and Rashba SOCs on the transport properties of graphene monolayer systems have extensively been studied in the recent years [5,6,[11][12][13][14]. For instance, it was shown that spin polarization induced by a charge current can reside in the graphene plane and perpendicular to the electric field while its sign changes by varying the Fermi level through an external gate voltage [11]. Also, it was theoretically found that the interplay of massive electrons with SOC or strain in a graphene layer can...

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Current-induced spin polarization in graphene due to Rashba spin-orbit interaction

Cited by 31 publications

References 28 publications

Current-induced spin polarization and spin-orbit torque in graphene

Current-induced spin polarization and spin-orbit torque in graphene

Thermoelectric and thermospin transport in a ballistic junction of graphene

Strain-controlled spin and charge pumping in graphene devices via spin-orbit coupled barriers

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