Direct and inverse superspin Hall effect in two-dimensional systems: Electrical detection of spin supercurrents

Risinggård, Vetle Kjær; Linder, Jacob

doi:10.1103/physrevb.99.174505

Cited by 8 publications

(6 citation statements)

References 79 publications

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“…80 This superspin Hall effect and the corresponding inverse effect, namely the inverse superspin Hall effect, give rise to a phase shift in the Josephson junction, which can be used to detect the spin polarization of a supercurrent carried by triplet Cooper pairs. 81 On the other hand, spin pumping is a mature technique used in non-superconducting spintronics to perform dynamic spin injection. 82 A recent study showed that spin can be pumped to a superconducting NbN film via quasiparticles.…”

Section: Experimental Evidence Of Pure Spin Supercurrents-a Systemati...mentioning

confidence: 99%

Boosting spintronics with superconductivity

2021

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Spintronics aims to utilize the spin degree of freedom for energy-efficient, non-volatile memory and logic devices. In this research update, we review state-of-the-art developments and new directions in charge-and spin-based memory/logic with a focus on spintronics and the fascinating potential for superconductivity to boost spin transmission via spin-polarized quasiparticles or triplet Cooper pairs.

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Section: Experimental Evidence Of Pure Spin Supercurrents-a Systemati...mentioning

confidence: 99%

Boosting spintronics with superconductivity

2021

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“…On the other hand, the spin current in the SC state has very low dissipation (if any) because it is purely due to the flow of a supercurrent. In other words, it is the property of the Cooper pair condensate and long-range coherence is guaranteed, making it a spin supercurrent [27,[50][51][52].…”

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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“…This expression also contains the Josephson Hall current I y that would flow through the F region if the leads did not act as voltage probes. Alternatively, the planar Josephson Hall effect could be experimentally verified by replacing the transverse normal leads with superconducting leads S L1 and S L2 75 . Then, Here, we have focused on transverse charge currents in topological Josephson junctions.…”

Section: Conclusion and Experimental Proposalsmentioning

confidence: 99%

“…Then, Here, we have focused on transverse charge currents in topological Josephson junctions. For future research on topological Josephson junctions, it might also prove fruitful to study the role of superspin Hall currents 75,77 and spin polarizations [78][79][80] , known from semiconductor/superconductor or ferromagnet/superconductor heterostructures. dation) through SFB 1170, project-id 258499086, through Grant No.…”

Section: Conclusion and Experimental Proposalsmentioning

confidence: 99%

Planar Josephson Hall effect in topological Josephson junctions

Maistrenko,

Scharf,

Manske

et al. 2020

Preprint

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Josephson junctions based on three-dimensional topological insulators offer intriguing possibilities to realize unconventional p-wave pairing and Majorana modes. Here, we provide a detailed study of the effect of a uniform magnetization in the normal region: We show how the interplay between the spin-momentum locking of the topological insulator and an in-plane magnetization parallel to the direction of phase bias leads to an asymmetry of the Andreev spectrum with respect to transverse momenta. If sufficiently large, this asymmetry induces a transition from a regime of gapless, counterpropagating Majorana modes to a regime with unprotected modes that are unidirectional at small transverse momenta. Intriguingly, the magnetization-induced asymmetry of the Andreev spectrum also gives rise to a Josephson Hall effect, that is, the appearance of a transverse Josephson current. The amplitude and current phase relation of the Josephson Hall current are studied in detail. In particular, we show how magnetic control and gating of the normal region can enable sizable Josephson Hall currents compared to the longitudinal Josephson current. Finally, we also propose in-plane magnetic fields as an alternative to the magnetization in the normal region and discuss how the planar Josephson Hall effect could be observed in experiments.

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Direct and inverse superspin Hall effect in two-dimensional systems: Electrical detection of spin supercurrents

Cited by 8 publications

References 79 publications

Boosting spintronics with superconductivity

Boosting spintronics with superconductivity

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

Planar Josephson Hall effect in topological Josephson junctions

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