Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling

Bathen, Marianne Etzelmüller; Linder, Jacob

doi:10.1038/srep41409

Cited by 18 publications

(16 citation statements)

References 74 publications

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“…Unfortunately, particle-hole symmetry is generally preserved in a superconductor and this leads to a perfect cancellation of the thermoelectric current due to counterpropagating electron and hole flows. The symmetry can be broken with external magnetic fields or spin-polarized bands [18], leading to sizable values of S as demonstrated both theoretically [19,20,21,22,23,24,25,26,27,28] and experimentally [29,30]. Another possibility is to drive the junction out of equilibrium beyond the linear response regime.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads

2017

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Abstract. We discuss the nonlinear Andreev current of an interacting quantum dot coupled to spinpolarized and superconducting reservoirs when voltage and temperature biases are applied across the nanostructure. Due to the particle-hole symmetry introduced by the superconducting (S) lead, the subgap spin current vanishes identically. Nevertheless, the Andreev charge current depends on the degree of polarization in the ferromagnetic (F) contact since the shift of electrostatic internal potential of the conductor depends on spin orientation of the charge carrier. This spin-dependent potential shift characterizes nonlinear responses in our device. We show how the subgap current versus the bias voltage or temperature difference depends on the lead polarization in two cases, namely (i) S-dominant case, when the dot-superconductor tunneling rate (ΓR) is much higher than the ferromagnet-dot tunnel coupling (ΓL), and (ii) F-dominant case, when ΓL ≫ ΓR. For the ferromagnetic dominant case the spin-dependent potential shows a nonmonotonic behavior as the dot level is detuned. Thus the subgap current can also exhibit interesting behaviors such as current rectification and the maximization of thermocurrents with smaller thermal biases when the lead polarization and the quantum dot level are adjusted.

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Section: Introductionmentioning

confidence: 99%

Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads

2017

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“…(149). The spin currents induced in the case of two spin-split superconductors, and the additional effects of Josephson coupling, magnetization texture and spin-orbit effects are discussed in [286,287].…”

Section: Thermally Induced Spin Currentsmentioning

confidence: 99%

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Heikkilä

Силаев

Virtanen

et al. 2019

Progress in Surface Science

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A ferromagnetic insulator (FI) attached to a conventional superconductor (S) changes drastically the properties of the latter. Specifically, the exchange field at the FI/S interface leads to a splitting of the superconducting density of states. If S is a superconducting film, thinner than the superconducting coherence length, the modification of the density of states occurs over the whole sample. The coexistence of the exchange splitting and superconducting correlations in S/FI structures leads to striking transport phenomena that are of interest for applications in thermoelectricity, superconducting spintronics and radiation sensors. Here we review the most recent progress in understanding the transport properties of FI/S structures by presenting a complete theoretical framework based on the quasiclassical kinetic equations. We discuss the coupling between the electronic degrees of freedom, charge, spin and energy, under non-equilibrium conditions and its manifestation in thermoelectricity and spin-dependent transport.

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“…Now, triplet supercurrents formed by spin-polarized Cooper pairs add the possibility of transporting a net spin component at zero resistance and thus pave the way for spintronic devices that are less liable to overheat [6][7][8][9][10][11][12][13][14][15][16]. The key challenge in the field is the nonequilibrium and on-demand generation of equal-spin Cooper pairs in a viable fashion [17][18][19][20][21], desirably avoiding the complicated manipulation of magnetic components.…”

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confidence: 99%

On-demand thermoelectric generation of equal-spin Cooper pairs

Keidel

Hwang

Trauzettel

et al. 2020

Phys. Rev. Research

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Superconducting spintronics is based on the creation of spin-triplet Cooper pairs in ferromagnetsuperconductor (F-S) hybrid junctions. Previous proposals to manipulate spin-polarized supercurrents on-demand typically require the ability to carefully control magnetic materials. We, instead, propose a quantum heat engine that drives equal-spin supercurrents on-demand without the need for manipulating magnetic components. We consider a S-F-S junction, connecting two leads at different temperatures, on top of the helical edge of a two-dimensional topological insulator. The heat and charge currents generated by the thermal bias are caused by different transport processes, where electron cotunneling is responsible for the heat flow to the cold lead and, strikingly, only crossed Andreev reflections contribute to the charge current. Such a purely nonlocal Andreev thermoelectric effect generates a spin-polarized supercurrent between the superconductors that can be switched on/off by tuning their relative phase. We further demonstrate that the detection of the spin-triplet supercurrent is facilitated by rather low fluctuations of the thermoelectric current for temperature gradients comparable to the superconducting gap. arXiv:1907.00965v2 [cond-mat.mes-hall]

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Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling

Cited by 18 publications

References 74 publications

Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads

Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

On-demand thermoelectric generation of equal-spin Cooper pairs

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