Yu-Shiba-Rusinov states in two-dimensional superconductors with arbitrary Fermi contours

Ortuzar, Jon; Trivini, Stefano; Alvarado, Miguel; Rouco, Mikel; Zaldívar, Javier; Yeyati, A. Levy; Pascual, José; Bergeret, F. S.

doi:10.1103/physrevb.105.245403

Cited by 13 publications

(1 citation statement)

References 64 publications

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“…Much of the recent effort devoted to the study of these excitations is driven by experimental advances in scanning tunneling spectroscopy, which allow one to access the spectral properties of YSR excitations with atomicscale resolution [4][5][6]. For example, from the spectrum and spatial dependence of the YSR excitations, we can learn about nonconventional pairing properties or the symmetry of the Fermi surface of the host superconductor [7][8][9]. In addition to magnetic impurities on the surface of superconductors, the YSR excitations have also been investigated in superconducting devices with molecular junctions [10] as well as quantum dots with superconducting leads [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Robust spin polarization of Yu-Shiba-Rusinov states in superconductor/ferromagnetic insulator heterostructures

et al. 2023

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Yu-Shiba-Rusinov (YSR) states arise as subgap excitations of a magnetic impurity in a superconducting host. Taking into account the quantum nature of the impurity spin in a single-site approximation, we study the spectral properties of the YSR excitations of a system of magnetic impurity in a spin-split superconductor, i.e., a superconductor in proximity to a ferromagnetic insulator at zero external magnetic fields. The YSR excitations of this system exhibit a robust spin polarization that is protected from fluctuations and environmental noise by the exchange field of the ferromagnetic insulator, which can be as large as a few Tesla. We compare the results of this quantum approach to the classical approach, which conventionally predicts fully polarized YSR excitations even in the absence of exchange and external magnetic field. Turning on a small magnetic field, we show the latter splits the YSR excitations in the regime where the impurity is strongly coupled to the superconductor, whilst the classical approach predicts no such splitting. The studied system can potentially be realized in a tunnel junction connected to a quantum dot in proximity to a spin-split superconductor.

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Section: Introductionmentioning

confidence: 99%

Robust spin polarization of Yu-Shiba-Rusinov states in superconductor/ferromagnetic insulator heterostructures

et al. 2023

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Superconducting density of states from scanning tunneling microscopy

Suderow

2024

Encyclopedia of Condensed Matter Physics

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Changing the Interaction of a Single-Molecule Magnetic Moment with a Superconductor

et al. 2023

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The exchange interaction of a brominated Co-porphyrin molecule with the Cooper pair condensate of Pb(111) is modified by reducing the Co–surface separation. The stepwise dehalogenation and dephenylation change the Co adsorption height by a few picometers. Only the residual Co-porphine core exhibits a Yu-Shiba-Rusinov bound state with low binding energy in the Bardeen-Cooper-Schrieffer energy gap. Accompanying density functional calculations reveal that the Co normald z 2 orbital carries the molecular magnetic moment and is responsible for the intragap state. The calculated spatial evolution of the Yu-Shiba-Rusinov wave function is compatible with the experimentally observed oscillatory attenuation of the electron–hole asymmetry with increasing lateral distance from the magnetic porphine center.

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Yu-Shiba-Rusinov states in two-dimensional superconductors with arbitrary Fermi contours

Cited by 13 publications

References 64 publications

Robust spin polarization of Yu-Shiba-Rusinov states in superconductor/ferromagnetic insulator heterostructures

Robust spin polarization of Yu-Shiba-Rusinov states in superconductor/ferromagnetic insulator heterostructures

Superconducting density of states from scanning tunneling microscopy

Changing the Interaction of a Single-Molecule Magnetic Moment with a Superconductor

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