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RESEARCH PRODUCT
Coherent coupling between vortex bound states and magnetic impurities in 2D layered superconductors
Hermann SuderowSamuel Mañas‐valeroVíctor BarrenaA. FenteEugenio CoronadoMar García-hernándezEdwin HerreraJosé J. BaldovíJosé J. BaldovíSunghun ParkAlfredo Levy YeyatiFederico MompeanIsabel GuillamónAngel RubioAngel Rubiosubject
Superconductivityelectronic-structureScienceGeneral Physics and AstronomyFOS: Physical sciences01 natural sciences7. Clean energyTopologyGeneral Biochemistry Genetics and Molecular BiologyArticle010305 fluids & plasmasMarie curieSuperconducting properties and materialsSuperconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated ElectronsMagnetic properties and materialsOriganumCondensed Matter::Superconductivity0103 physical sciencesBound stateMesoscale and Nanoscale Physics (cond-mat.mes-hall)010306 general physicsSuperconductivitatMaterialsSuperconductivityPhysicsMultidisciplinaryStrongly Correlated Electrons (cond-mat.str-el)Condensed Matter - Mesoscale and Nanoscale Physicsmajorana fermionsCondensed Matter - SuperconductivityQcoreFísicaGeneral ChemistrylineHumanitiesdescription
Bound states in superconductors are expected to exhibit a spatially resolved electron-hole asymmetry which is the hallmark of their quantum nature. This asymmetry manifests as oscillations at the Fermi wavelength, which is usually tiny and thus washed out by thermal broadening or by scattering at defects. Here we demonstrate theoretically and confirm experimentally that, when coupled to magnetic impurities, bound states in a vortex core exhibit an emergent axial electron-hole asymmetry on a much longer scale, set by the coherence length. We study vortices in 2H-NbSe2 and in 2H-NbSe1.8S0.2 with magnetic impurities, characterizing these with detailed Hubbard-corrected density functional calculations. We find that the induced electron-hole imbalance depends on the band character of the superconducting material. Our results show that coupling between quantum bound states in superconductors is remarkably robust and has a strong influence in tunneling measurements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-08-03 |