Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems

Hamamoto, Keita; Ezawa, Motohiko; Kim, Kun Woo; Morimoto, Takahiro; Nagaosa, Naoto

doi:10.1103/physrevb.95.224430

Cited by 86 publications

(57 citation statements)

References 45 publications

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“…This prediction is consistent with Ref. [47], which discussed a second harmonic signal in the spin current based on symmetry arguments. Furthermore, one can apply selection rules to V zy , which is the component relevant for the spin Hall effect [29].…”

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confidence: 92%

High-harmonic generation in spin-orbit coupled systems

et al. 2020

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We study high-harmonic generation in two-dimensional electron systems with Rashba and Dresselhaus spinorbit coupling and derive harmonic generation selection rules with the help of group theory. Based on the band structures of these minimal models and explicit simulations we reveal how the spin-orbit parameters control the cutoff energy in the high-harmonic spectrum. We also show that the magnetic field and polarization dependence of this spectrum provides information on the magnitude of the Rashba and Dresselhaus spin-orbit coupling parameters. The shape of the Fermi surface can be deduced at least qualitatively and if only one type of spin-orbit coupling is present, the coupling strength can be determined.

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confidence: 92%

High-harmonic generation in spin-orbit coupled systems

et al. 2020

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“…If the ferromagnetic layer is conducting, such variation in magnon density will in turn alter the scattering rate of the electrons in the ferromagnetic layer and hence change the total resistance of the bilayer accordingly. [35][36][37][38][39][40][41] † Similar nonlinear spin current was also proposed 43,44 recently in other systems with broken inversion symmetry. When an external electric field E is applied along a certain direction in the momentum space (dash-dotted line), a nonlinear pure spin current js(E 2 ) is generated at the second order in E, due to spin-momentum locking.…”

Section: Model Hamiltoniansupporting

confidence: 67%

Theory of bilinear magneto-electric resistance from topological-insulator surface states

Zhang¹,

Vignale²

2018

Spintronics XI

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We theoretically investigate a new kind of nonlinear magnetoresistance on the surface of three-dimensional topological insulators (TIs). At variance with the unidirectional magnetoresistance (UMR) effect in magnetic bilayers, this nonlinear magnetoresistance does not rely on a conducting ferromagnetic layer and scales linearly with both the applied electric and magnetic fields; for this reason, we name it bilinear magneto-electric resistance (BMER). We show that the sign and the magnitude of the BMER depends sensitively on the orientation of the current with respect to the magnetic field as well as the crystallographic axes -a property that can be utilized to map out the spin texture of the topological surface states via simple transport measurement, alternative to the angle-resolved photoemission spectroscopy (ARPES).

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“…In normal dissipative Rashba systems, spin density [49] and spin current [17,18] can also be generated when an external electric field E is applied. In such a case, the coefficients γ and η are shown by the black dashed curves in FIG.3.…”

Section: Comparison To Normal Statesmentioning

confidence: 99%

Spin supercurrent in two-dimensional superconductors with Rashba spin-orbit interaction

Hiroki

Hamamoto

et al. 2019

Commun Phys

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† These authors contribute equally.Spin current is a central theme in spintronics, and its generation is a keen issue. The spin-polarized current injection from the ferromagnet, spin battery, and spin Hall effect have been used to generate spin current, but Ohmic currents in the normal state are involved in all of these methods. On the other hand, the spin and spin current manipulation by the supercurrent in superconductors is a promising route for dissipationless spintronics. Here we show theoretically that, in two-dimensional superconductors with Rashba spin-orbit interaction, the generation of dissipationless bulk spin current by charge supercurrent becomes highly efficient, exceeding that in normal states in the dilute limit, i.e. when the chemical potential is close to the band edge, although the spin density becomes small there. This result manifests the possibility of creating new spintronic devices with long-range coherence.In spintronics, spin current plays an essential role to transfer the information associated with the spin degrees of freedom. Therefore the generation of spin current is an important issue, and several methods have been proposed and experimentally verified [1]. Various methods, such as the spin polarized current injection from the ferromagnet [2-4], spin battery [5-9], and spin Hall effect [10][11][12][13][14][15][16], have been employed to generate the spin current. It has been proposed also that the spin current second order in the electric field can be generated in noncentrosymmetric systems with spin-orbit interaction [17,18]. The spin currents mentioned above are either carried by itinerant electrons through dissipative electric currents, or by localized magnetic moments through exchange interactions. However, there can also be non-dissipative spin current in itinerant-electron systems. In this case, it is an equilibrium spin current without dissipation [19]. Although such a spin current is detectable according to Sonin [20], it does not contribute to the transport property in a set up where the spin current can flow in and out.On the other hand, superconducting spintronics is an emerging field attracting recent interest [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Although the spin degrees of freedom are usually quenched in singlet superconductors, the triplet component can be finite in noncentrosymmetric superconductors, ferromagnet-superconductor hybrids and Josephson junctions, or odd-parity superconductors, where the spins become (partially) active. Therefore, it is an intriguing issue if one can generate a spin current in superconductors with zero or small dissipation. Actually, the spin supercurrent has been discussed in He3 related to the internal degrees of freedom [39]. Recently, Leurs et al. [40] have reexamined the spin supercurrent in spin-orbit coupled systems, and classified it to the coherent and noncoherent parts, only the latter of which contributes to the continuity equation of the spin density and its gen-eration or manipulation is the focus of sup...

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Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems

Cited by 86 publications

References 45 publications

High-harmonic generation in spin-orbit coupled systems

High-harmonic generation in spin-orbit coupled systems

Theory of bilinear magneto-electric resistance from topological-insulator surface states

Spin supercurrent in two-dimensional superconductors with Rashba spin-orbit interaction

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