Thermoelectric effect enhanced by resonant states in graphene

Inglot, M.; Dyrdał, A.; Dugaev, V. K.; Barnaś, J.

doi:10.1103/physrevb.91.115410

Cited by 17 publications

(12 citation statements)

References 45 publications

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“…Graphene is a typical two-dimensional material, whose band structure have two Dirac cones designated as K and K ′ valleys [22]. Optical injection of spin current to graphene has been proposed as candidate of optospintronic devices [23][24][25][26][27][28]. The schemes for excitation of localized spin currents along zigzag edges or domain walls make integrated opto-spintronic devices feasible [27].…”

Section: Introductionmentioning

confidence: 99%

Optical injection of spin current into a zigzag nanoribbon of monolayer MoS2 with antiferromagnetic Kekule distortion

Luo¹

2019

Phys. Rev. B

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Kekule pattern of (anti)ferromagnetic exchange field on the monolayer M oS2 could be induced by proximity to the (111) surface of BiF eO3 on both sides. The magnetization orientations of the substrates control the pattern of exchange field, which in turn switch the band structures of the lowest zigzag edge states between being metallic and insulating. The lowest four zigzag edge bands provides conducting channels with spin-polarized current. Optical excitation of carriers in these bands generate sizable spin and charge currents, which is theoretically modelled by the perturbation solution of the semiconductor Bloch equation.

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Section: Introductionmentioning

confidence: 99%

Optical injection of spin current into a zigzag nanoribbon of monolayer MoS2 with antiferromagnetic Kekule distortion

Luo¹

2019

Phys. Rev. B

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“…Recently, the properties of spin-polarized current via electric field [65,66] and photoinduced spin-current [67,68] have been considered in graphene layer with isotropic Rashba spin-orbit interaction. In the former case, it has also been shown the coupling between charge current and spin polarization due to adatom impurities [69].…”

Section: Introductionmentioning

confidence: 99%

The influence of anisotropic Rashba spin–orbit coupling on current-induced spin polarization in graphene

Hosseini

2017

J. Phys.: Condens. Matter

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Abstract. We consider a disordered graphene layer with anisotropic Rashba spin-orbit coupling subjected to a longitudinal electric field. Using the linear response theory we calculate current-induced spin polarization including in-plane normal and parallel components with respect to the electric field direction. Unlike the case of isotropic Rashba spin-orbit where the normal component of spin polarization is linear in terms of Fermi energy around the Dirac point, anisotropic Rashba spin-orbit can result in non-linear dependence of this component at such energies within the Lifshitz points. Furthermore, we show that anisotropic Rashba interaction allows for tuning the direction of spin polarization from perpendicular direction to the parallel one such that for certain values of Rashba parameters the magnitudes of both components can also be quenched. The effect of carriers scattering on randomly distributed non-magnetic disorders is also taken into account by calculating vertex correction. This results in modification of spin polarization components depending on the relative strength of Rashba parameters.

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“…23 Moreover, resonant scattering from impurities with short-range potential may lead to an enhanced Seebeck coefficient, when the chemical potential is in the neighborhood of the resonances. [24][25][26][27] Of particular interest are currently thermoelectric properties of graphene nanoribbons, which may exhibit an enhanced thermoelectric efficiency. [28][29][30][31][32][33][34] This efficiency may be additionally enhanced by certain structural defects like antidots, for instance.…”

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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Thermoelectric effect enhanced by resonant states in graphene

Cited by 17 publications

References 45 publications

Optical injection of spin current into a zigzag nanoribbon of monolayer MoS2 with antiferromagnetic Kekule distortion

Optical injection of spin current into a zigzag nanoribbon of monolayer MoS2 with antiferromagnetic Kekule distortion

The influence of anisotropic Rashba spin–orbit coupling on current-induced spin polarization in graphene

Thermoelectric and thermospin transport in a ballistic junction of graphene

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