Supercurrent-induced charge-spin conversion in spin-split superconductors

Aikebaier, Faluke; Силаев, М. А.; Heikkilä, Tero T.

doi:10.1103/physrevb.98.024516

Cited by 18 publications

(18 citation statements)

References 43 publications

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“…Using superconductors as detectors allowed us to have spectroscopic information on the QPs, by using the coherence peak in the detector density of states. This work paves the way for new spin-dependent heat transport experiments, as well as the generation of spin supercurrents by out-of-equilibrium distribution functions in conventional superconductors 18,42 .…”

Section: Resultsmentioning

confidence: 91%

Evidence for spin-dependent energy transport in a superconductor

Kuzmanović¹,

Wu²,

Weideneder³

et al. 2020

Nat Commun

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In ferromagnetic materials, spin up and down electrons can carry different heat currents. This spin-dependent energy excitation mode ('spin energy mode') occurs only when spin up and down energy distribution functions are different. In superconductors, heat is carried by quasiparticle excitations and the spin energy mode can be excited by spin-polarised current injection. In the presence of a finite Zeeman magnetic field, the spin energy mode surprisingly leads to a charge imbalance (different numbers of hole-and electron-like quasiparticles) at the superconducting gap edge. By performing spin-resolved spectroscopy of the out-ofequilibrium quasiparticle populations in a mescoscopic superconductor, we reveal that their distribution functions are non-Fermi-Dirac. In addition, our spectroscopic technique allows us to observe a charge imbalance, localised in energy to the gap edge and thus unambiguously identify the spin energy mode. Our results agree well with theory and shed light on energy transport in superconducting spintronics.

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Section: Resultsmentioning

confidence: 91%

Evidence for spin-dependent energy transport in a superconductor

Kuzmanović¹,

Wu²,

Weideneder³

et al. 2020

Nat Commun

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“…In the presence of a supercurrent, all coefficients of the matrix in Eq. (24) are nonzero (Aikebaier et al, 2017). As a result, for example the spin and charge modes are directly coupled by diffusion.…”

Section: B Non-local Conductance Measurements In Spin-split Superconmentioning

confidence: 99%

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

et al. 2018

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We review the recent progress in understanding the properties of spin-split superconductors under non-equilibrium conditions. Recent experiments and theories demonstrate a rich variety of transport phenomena occurring in devices based on such materials that suggest direct applications in thermoelectricity, low-dissipative spintronics, radiation detection and sensing. We discuss different experimental situations and present a theoretical framework based on quantum kinetic equations. Within this framework we provide an accurate description of the non-equilibrium distribution of charge, spin and energy, which are the relevant non-equilibrium modes, in different hybrid structures. We also review experiments on spin-split superconductors and show how transport measurements reveal the properties of the non-equilibrium modes and their mutual coupling. We discuss in detail spin injection and diffusion and very large thermoelectric effects in spin-split superconductors.

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“…Now let us consider the second part of the spin current determined by the correction to the distribution function. Due to the smallness of the order parameter near H c 2 it can be written as , where is the quantity which can be considered as the spin-dependent shift of the chemical potential and is the spin-dependent component of the distribution function 5,11 . Besides f T 3 the vortex motion excites the electron-hole imbalance described by the component of distribution function .…”

Section: Resultsmentioning

confidence: 99%

Flux flow spin Hall effect in type-II superconductors with spin-splitting field

Vargunin

Силаев

2019

Sci Rep

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We predict the very large spin Hall effect in type-II superconductors whose mechanism is drastically different from the previously known ones. We find that in the flux-flow regime the spin is transported by the spin-polarized Abrikosov vortices moving under the action of the Lorenz force in the direction perpendicular to the applied electric current. Due to the large vortex velocities the spin Hall angle can be of the order of unity in realistic systems based on the high-field superconductors, superconductor/ferromagnet hybrid structures or the recently developed superconductor/ferromagnetic insulator proximity structures. We propose the realization of high-frequency pure spin current generator based on the periodic structure of moving vortex lattices. We find the patterns of charge imbalance and spin accumulation generated by moving vortices, which can be used for the electrical detection of individual vortex motion. The new mechanism of inverse flux-flow spin Hall effect is found based on the driving force acting on the vortices in the presence of injected spin current which results in the generation of transverse voltage.

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Supercurrent-induced charge-spin conversion in spin-split superconductors

Cited by 18 publications

References 43 publications

Evidence for spin-dependent energy transport in a superconductor

Evidence for spin-dependent energy transport in a superconductor

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

Flux flow spin Hall effect in type-II superconductors with spin-splitting field

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