Inverse spin Hall effect in superconductor/normal-metal/superconductor Josephson junctions

Mal’shukov, A. G.; Sadjina, Severin; Brataas, Arne

doi:10.1103/physrevb.81.060502

Cited by 56 publications

(73 citation statements)

References 27 publications

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“…We have found that net spin currents therefore emerge and accumulate spontaneously at the edges, in the absence of charge flow, when properly modulating φ in finite-size two-dimensional intrinsically spin-orbit coupled S/F/S hybrid structures. This work can be viewed as complementary to previous studies involving edge spin currents in non-superconducting spin-orbit coupled structures where externally imposed fields were required [45,48,49,[51][52][53]70]. We have shown that remarkably, edge spin currents can be spontaneously driven by the coupling of intrinsic properties of a system, i.e.…”

Section: Discussionsupporting

confidence: 62%

“…The spin-Hall phenomenon was also extensively studied in superconducting heterostructures where various types of spin-orbit coupling (SOC) play key roles [23,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70]. For example, the out-of-plane component of the spin density was theoretically investigated [53] in a spin-orbit coupled S/N/S junction (with normal metal (N) interlayer) subject to an inhomogeneous external magnetic field. It was found that the spin density varies along the transverse direction, leading to a longitudinal phase difference between the S electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Spontaneous edge accumulation of spin currents in finite-size two-dimensional diffusive spin–orbit coupledSFSheterostructures

Alidoust

Halterman

2015

New J. Phys.

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We theoretically study spin and charge currents through finite-size two-dimensional s-wave superconductor/uniform ferromagnet/s-wave superconductor (S/F/S) junctions with intrinsic spin-orbit interactions (ISOIs) using a quasiclassical approach. Considering experimentally realistic parameters, we demonstrate that the combination of spontaneously broken time-reversal symmetry and lack of inversion symmetry can result in spontaneously accumulated spin currents at the edges of finite-size two-dimensional magnetic S/F/S hybrids. Due to the spontaneous edge spin accumulation, the corners of the F wire host the maximum spin current density. We further reveal that this type edge phenomena is robust and independent of either the actual type of ISOIs or exchange field orientation. Moreover, we study the spin current-phase relations in these diffusive spin-orbit coupled S/F/S junctions. Our results unveil net spin currents, not accompanied by charge supercurrents, that spontaneously accumulate at the sample edges through a modulating superconducting phase difference. Finally, we discuss possible experimental implementations to observe these edge phenomena.

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Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Spontaneous edge accumulation of spin currents in finite-size two-dimensional diffusive spin–orbit coupledSFSheterostructures

Alidoust

Halterman

2015

New J. Phys.

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“…The spontaneous phase shift of Josephson current has been obtained in several FM/SC systems [25,27,30,35,[41][42][43][44][45][46][47][48][49][50][51][52][53][54]]. Here we demonstrate that this effect is essential only for the case of strong ferromagnets.…”

Section: Spontaneous Josephson Current Through Strong Ferromagnetssupporting

confidence: 54%

Gauge theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets

2017

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Gauge theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets Bobkova, I. V.; Silaev, Mikhail Bobkova, I. V., Bobkov, A. M., & Silaev, M. (2017). Gauge theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets. Physical Review B, 96 (9) We present the generalized quasiclassical theory of the long-range superconducting proximity effect in heterostructures with strong ferromagnets, where the exchange splitting is of the order of Fermi energy. In the ferromagnet the propagation of equal-spin Cooper pairs residing on the spin-split Fermi surfaces is shown to be governed by the spin-dependent Abelian gauge field which results either from the spin-orbital coupling or from the magnetic texture. This additional gauge field enters into the quasiclassical equations in superposition with the usual electromagnetic vector potential and results in the generation of spontaneous superconducting currents and phase shifts in various geometries which provide the sources of long-range spin-triplet correlations. We derive the Usadel equations and boundary conditions for the strong ferromagnet and consider several generic examples of the Josephson systems supporting spontaneous currents.

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“…The dc Josephson current with SO interaction in the normal region was investigated theoretically by a lot of groups, for normal metal with magnetic impurities [32], two-dimensional electron gas (2DEG) in semiconductor heterostructures [33][34][35][36][37][38][39], open quantum dots [40], quantum dots with tunnel barriers [41][42][43][44][45][46][47], carbon nanotubes [48], quantum wires or nanowires [49][50][51][52], quantum point contacts [53,54], topological insulators [55], and others [56]. The SO interaction breaks the spin degeneracy of Andreev levels when the time-reversal symmetry is broken by the phase difference ϕ = 0 even in the absence of magnetic field [40,56].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Josephson effect induced by spin-orbit interaction and Zeeman effect in semiconductor nanowires

2014

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We investigate theoretically the Josephson junction of semiconductor nanowire with strong spin-orbit (SO) interaction in the presence of magnetic field. By using a tight-binding model, the energy levels E n of Andreev bound states are numerically calculated as a function of phase difference ϕ between two superconductors in the case of short junctions. The dc Josephson current is evaluated from the Andreev levels. In the absence of SO interaction, a 0-π transition due to the magnetic field is clearly observed. In the presence of SO interaction, the coexistence of SO interaction and Zeeman effect results in E n (−ϕ) = E n (ϕ), where the anomalous Josephson current flows even at ϕ = 0. In addition, the direction dependence of critical current is observed, in accordance with experimental results.

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Inverse spin Hall effect in superconductor/normal-metal/superconductor Josephson junctions

Cited by 56 publications

References 27 publications

Spontaneous edge accumulation of spin currents in finite-size two-dimensional diffusive spin–orbit coupledSFSheterostructures

Spontaneous edge accumulation of spin currents in finite-size two-dimensional diffusive spin–orbit coupledSFSheterostructures

Gauge theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets

Anomalous Josephson effect induced by spin-orbit interaction and Zeeman effect in semiconductor nanowires

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