0000000000423221

AUTHOR

F. Sebastian Bergeret

showing 4 related works from this author

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

2019

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 co-existence 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 understandin…

Superconducting coherence length---FOS: Physical sciencesInsulator (electricity)02 engineering and technology01 natural sciencesSuperconductivity (cond-mat.supr-con)Condensed Matter::Superconductivity0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)SuperconductivityPhysicsCondensed Matter - Materials Science010304 chemical physicsCondensed matter physicsSpintronicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed Matter - SuperconductivityMaterials Science (cond-mat.mtrl-sci)Surfaces and InterfacesGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics3. Good healthSurfaces Coatings and FilmsConventional superconductorFerromagnetismDensity of states0210 nano-technologyTransport phenomenaProgress in Surface Science
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Coexistence of superconductivity and spin-splitting fields in superconductor/ferromagnetic insulator bilayers of arbitrary thickness

2021

Ferromagnetic insulators (FI) can induce a strong exchange field in an adjacent superconductor (S) via the magnetic proximity effect. This manifests as spin splitting of the BCS density of states of the superconductor, an important ingredient for numerous superconducting spintronics applications and the realization of Majorana fermions. A crucial parameter that determines the magnitude of the induced spin splitting in FI/S bilayers is the thickness of the S layer d: In very thin samples, the superconductivity is suppressed by the strong magnetism. By contrast, in very thick samples, the spin splitting is absent at distances away from the interface. In this work, we calculate the density of …

---suprajohtavuusnanoelektroniikkaCondensed Matter - SuperconductivityEuropean researchOdd Triplet SuperconductivityFOS: Physical sciencesequation02 engineering and technologyPublic administration021001 nanoscience & nanotechnology01 natural sciences3. Good healthsuprajohteetSuperconductivity (cond-mat.supr-con)Spin splittingPolitical scienceCondensed Matter::Superconductivity0103 physical sciencestransport010306 general physics0210 nano-technologyEuS
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Colloquium: Nonequilibrium effects in superconductors with a spin-splitting field

2018

This Colloquium discusses the recent progress in understanding the properties of spin-split superconductors under nonequilibrium 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. This text discusses different experimental situations and presents a theoretical framework based on quantum kinetic equations. This framework provides an accurate description of the nonequilibrium distribution of charge, spin, and energy, which are the relevant nonequilibrium modes, in different hybrid structure…

---General Physics and AstronomyLibrary scienceFOS: Physical sciences02 engineering and technologysuperconductors01 natural sciences7. Clean energysuprajohteetSuperconductivity (cond-mat.supr-con)Spin splitting0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)media_common.cataloged_instanceEuropean union010306 general physicskvanttifysiikkamedia_commonPhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed Matter - SuperconductivityEuropean research021001 nanoscience & nanotechnologyquantum physicsCondensed Matter::Strongly Correlated Electrons0210 nano-technology
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Charge transport through spin-polarized tunnel junction between two spin-split superconductors

2019

We investigate transport properties of junctions between two spin-split superconductors linked by a spin-polarized tunneling barrier. The spin-splitting fields in the superconductors (S) are induced by adjacent ferromagnetic insulating (FI) layers with arbitrary magnetization. The aim of this study is twofold: On the one hand, we present a theoretical framework based on the quasiclassical Green's functions to calculate the Josephson and quasiparticle current through the junctions in terms of the different parameters characterizing it. Our theory predicts qualitative new results for the tunneling differential conductance, $dI/dV$, when the spin-splitting fields of the two superconductors are…

Josephson effect---suprajohtavuusFOS: Physical sciences02 engineering and technology01 natural sciencessuprajohteetSuperconductivity (cond-mat.supr-con)MagnetizationTunnel junctionCondensed Matter::Superconductivity0103 physical sciences010306 general physicsQuantum tunnellingSuperconductivityPhysicsCondensed matter physicssuperconductivityCondensed Matter - SuperconductivityJosephson effectOrder (ring theory)021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMagnetic anisotropyGeometric phaseproximity effect0210 nano-technology
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