Phase-controlled spin and charge currents in a superconductor-ferromagnet hybrid

Rezaei, Ali; Hussein, Robert; Kamra, Akashdeep; Belzig, Wolfgang

doi:10.1103/physrevresearch.2.033336

Cited by 4 publications

(3 citation statements)

References 80 publications

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“…Besides detectors and nonreciprocal electronics, superconductor-ferromagnet multilayers enable other novel phenomena. The spin-split superconductors can be used to create absolute spin valves [67], thermal logic circuits [147], coherent caloritronic systems [148][149][150], devices mixing nonequilibrium spin and equilibrium supercurrent transport [151] and thermal quantum devices [152][153][154]. Moreover, a rich dynamical response of the hybrid systems can be envisaged: the presence of superconductors influence the magnetic resonance by mediating magnetic interactions (as a consequence of the magnetic proximity effect) [20,155] and via the modified spin battery effect.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors

Geng,

Hijano,

Ilić

et al. 2023

Supercond. Sci. Technol.

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We review the use of hybrid thin films composed of superconductors and ferromagnets for creating non-reciprocal electronic components and self-biased detectors of electromagnetic radiation. We begin by introducing the theory behind these effects, as well as discussing various potential materials that can be used in the fabrication of these components. We then proceed with a detailed discussion on the fabrication and characterization of Al/EuS/Cu and EuS/Al/Co-based detectors, along with their noise analysis. Additionally, we suggest some approaches for multiplexing such self-biased detectors.

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Section: Discussion and Outlookmentioning

confidence: 99%

Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors

Geng,

Hijano,

Ilić

et al. 2023

Supercond. Sci. Technol.

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“…This is not true for nondiagonal correlation matrices, where coherences can develop and couple to the populations. This aspect is crucial, for example, in the so-called spin-valve setup [84][85][86][87][88] and for interacting nanojunctions displaying interference effects [44,89,90].…”

Section: A Diagonal Hybridization Matrixmentioning

confidence: 99%

Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study

Magazzù¹,

Grifoni²

2022

Phys. Rev. B

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We present a nonperturbative and formally exact approach for the charge transport in interacting nanojunctions based on a real-time path-integral formulation of the reduced system dynamics. For reservoirs of noninteracting fermions, the exact trace over the leads' degrees of freedom results in the time-nonlocal Feynman-Vernon influence functional, a functional of the Grassmann-valued paths of the nanojunction, which induces correlations among the tunneling transitions in and out of the nanojunction. An expansion of the influence functional in terms of the number of tunneling transitions, and integration of the Grassmann variables between the tunneling times, allows us to obtain a still exact generalized master equation for the populations of the reduced density matrix in the occupation-number representation, as well as a formally exact expression for the current. By borrowing the nomenclature of the famous spin-boson model, we parametrize the two-state dynamics of each single-particle fermionic degree of freedom, in the occupation-number representation, in terms of blips and sojourns. We apply our formalism to the exactly solvable resonant level model (RLM) and to the single-impurity Anderson model (SIAM), the latter being a prototype system for studying strong correlations. For both systems, we demonstrate a hierarchical diagrammatic structure. While the hierarchy closes at the second tier for the RLM, this is not the case for the interacting SIAM. Upon inspection of the current kernel, known results from various perturbative and nonperturbative approximation schemes to quantum transport in the SIAM are recovered. Finally, a noncrossing approximation for the hierarchical kernel is developed, which enables us to systematically decrease temperature at each next level of the approximation. Analytical results for a simplified fourth-tier scheme are presented both in equilibrium and nonequilibrium and with an applied magnetic field.

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“…This is not true for non-diagonal correlation matrices, where coherences can develop and couple to the populations. This aspect is crucial for example in the so-called spin-valve setup [82][83][84][85][86] and for interacting nanojunctions displaying interference effects [44,87,88].…”

Section: State-conserving Tunneling and Diagrammatic Rulesmentioning

confidence: 99%

Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study

Magazzù,

Grifoni

2021

Preprint

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Phase-controlled spin and charge currents in a superconductor-ferromagnet hybrid

Cited by 4 publications

References 80 publications

Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors

Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors

Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study

Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study

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