Quasiparticle focusing of bound states in two-dimensional s-wave superconductors
Mateo Uldemolins, Andrej Mesaros, Pascal Simon
DOI 10.1103/PhysRevB.105.144503 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
A magnetic impurity on a superconducting substrate induces in-gap Yu-Shiba-Rusinov (YSR) bound states, whose intricate spatial structure crucially influences the possibilities of engineering collective impurity states. By means of a saddle-point approximation, we study the scattering processes giving rise to YSR states in gapped, two-dimensional superconductors. Further, we develop a theory, which relates through a simple analytical expression, an arbitrary energy dispersion of normal electrons in a two-dimensional host to the spatial features of the YSR states. Namely, we find that flatter segments of the Fermi surface with large Fermi velocity enhance the local density of states (LDOS) around the impurity. Our analytical approximation is quantitatively accurate against tight-binding calculations on various lattices with different Fermi surfaces, and it allows to predict the shape and orientation of YSR states observed in scanning tunneling spectroscopy experiments. We illustrate our results with a model of NbSe2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Effects of nonmagnetic scatterers on the local density of states around a vortex in s-wave superconductors
similarity 0.94P. Miranović et al.
Source status unknown — claims are unverified
Quasiparticle Spectra around a Single Vortex in a d-Wave Superconductor
similarity 0.93Y. Morita et al.
Source status unknown — claims are unverified
Latent superconductivity at parallel interfaces in a superlattice dominated by another collective quantum phase
similarity 0.93V. N. Moura et al.
Source status unknown — claims are unverified
Quasiparticle spectrum around a vortex line in a d-wave superconductor
similarity 0.93Nils Schopohl & Kazumi Maki
Source status unknown — claims are unverified
Superconductivity in atomically thin films: Two-dimensional critical state model
similarity 0.93Filippo Gaggioli et al.
Source status unknown — claims are unverified
Anomalous density of states in a metallic film in proximity with a superconductor
similarity 0.93A. K. Gupta et al.
Source status unknown — claims are unverified