Thermally induced spin polarization of a two-dimensional electron gas

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

doi:10.1103/physrevb.87.245309

Cited by 32 publications

(41 citation statements)

References 28 publications

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“…The induced spin polarization is in the graphene plane, and is normal to the temperature gradient, similarly as in the case of 2D electron gas. 44 Physical mechanism of the spin polarization in graphene with Rashba spin-orbit coupling is also similar to the mechanism of spin polarization in 2D electron gas. Indeed, there is a nonzero spin polarization of an electron in the eigenstate |kn , which is perpendicular to the wavevector k. The magnitude of this spin polarization is small for k ≪ α/ v F and is equal to its maximum value equal to /2 for k ≫ α/ v F .…”

Section: A Spin Polarizationmentioning

confidence: 73%

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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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Section: A Spin Polarizationmentioning

confidence: 73%

“…This effect has been studied theoretically for the usual 2D electron gas with parabolic energy spectrum and Rashba spin-orbit coupling, [42][43][44] as well as in graphene. 41 In the ballistic junction considered in this paper, the spin density can be calculated using the formula…”

Section: A Spin Polarizationmentioning

confidence: 99%

Thermoelectric and thermospin transport in a ballistic junction of graphene

Inglot¹,

Dugaev

Barnaś

2015

Phys. Rev. B

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“…Assuming homogeneous conditions and taking as driving fields an electric field E x and a temperature gradient ∇ x T , we are interested in the generation of (i) a y-spin polarization s y (Edelstein [9,10] and thermal Edelstein [4,5] effects); (ii) a z-polarized spin current flowing along y, j z y (spin Hall [6] and spin Nernst [2,3] effects). In the presence of spin-orbit coupling, i.e., when spin is not conserved, the spin current has a diffusion term even under homogeneous conditions [42]:…”

Section: The Model and The Onsager Formulationmentioning

confidence: 99%

“…The wavy brackets represent the anticommutator and d = 2,3 the dimensionality. 5 Formally, the diagrams in Fig. 1, together with Eqs.…”

Section: The Kinetic Equationsmentioning

confidence: 99%

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Room-temperature spin thermoelectrics in metallic films

2014

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Considering metallic films at room temperature, we present the first theoretical study of the spin Nernst and thermal Edelstein effects that takes into account dynamical spin-orbit coupling, i.e., direct spin-orbit coupling with the vibrating lattice (phonons) and impurities. This gives rise to a novel process, namely, a dynamical side-jump mechanism, and to dynamical Elliott-Yafet spin relaxation, never before considered in this context. Both are the high-temperature counterparts of the well-known T = 0 side-jump and Elliott-Yafet, central to the current understanding of the spin Hall, spin Nernst and Edelstein (current-induced spin polarization) effects at low T . We consider the experimentally relevant regime T > T D , with T D the Debye temperature, as the latter is lower than room temperature in transition metals such as Pt, Au and Ta typically employed in spin injection/extraction experiments. We show that the interplay between intrinsic (Bychkov-Rashba type) and extrinsic (dynamical) spin-orbit coupling yields a nonlinear T dependence of the spin Nernst and spin Hall conductivities.

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Spin Hall Magnetoresistance and Spin Nernst Magnetothermopower in a Rashba System: Role of the Inverse Spin Galvanic Effect

et al. 2017

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In ferromagnet/normal-metal bilayers, the sensitivity of the spin Hall magnetoresistance and the spin Nernst magnetothermopower to the boundary conditions at the interface is of central importance. In general, such boundary conditions can be substantially affected by current-induced spin polarizations. In order to quantify the role of the latter, we consider a Rashba two-dimensional electron gas with a ferromagnet attached to one side of the system. The geometry of such a system maximizes the effect of current-induced spin polarization on the boundary conditions, and the spin Hall magnetoresistance is shown to acquire a non-trivial and asymmetric dependence on the magnetization direction of the ferromagnet.

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Thermally induced spin polarization of a two-dimensional electron gas

Cited by 32 publications

References 28 publications

Thermoelectric and thermospin transport in a ballistic junction of graphene

Thermoelectric and thermospin transport in a ballistic junction of graphene

Room-temperature spin thermoelectrics in metallic films

Spin Hall Magnetoresistance and Spin Nernst Magnetothermopower in a Rashba System: Role of the Inverse Spin Galvanic Effect

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