Impurity Effect on Kramer-Pesch Core Shrinkage in s-Wave Vortex and Chiral p-Wave Vortex
نویسندگان
چکیده
The low-temperature shrinking of the vortex core (Kramer-Pesch effect) is studied for an isolated single vortex for chiral p-wave and s-wave superconducting phases. The effect of nonmagnetic impurities on the vortex core radius is numerically investigated in the Born limit by means of a quasiclassical approach. It is shown that in the chiral p-wave phase the Kramer-Pesch effect displays a certain robustness against impurities owing to a specific quantum effect, while the s-wave phase reacts more sensitively to impurity scattering. This suggests chiral p-wave superconductors as promising candidates for the experimental observation of the Kramer-Pesch effect.
منابع مشابه
Quasi-Particle Spectrum around a Single Vortex in Superconductors s-Wave Case
Making use of the Bogoliubov-de Gennes equation, we study the quasi-particle spectrum and the vortex core structure of a single vortex in quasi 2D s-wave superconductors for small pF ξ0, where pF is the Fermi momentum and ξ0 = vF /∆0 is the coherence length (h̄ = 1). During our numerical calculation the particle number is conserved for each pF ξ0. In particular, we find that there are only 1 or ...
متن کاملRelation between Vortex Pinning Energy and Anderson’s Theorem
We discuss the elementary vortex pinning in type-II superconductors in connection with the Anderson’s theorem for nonmagnetic impurities. We address the following two issues. One is an enhancement of the vortex pinning energy in the unconventional superconductors. This enhancement comes from the pair-breaking effect of a nonmagnetic defect as the pinning center far away from the vortex core (i....
متن کاملRobustness of Majorana modes and minigaps in a spin-orbit-coupled semiconductor-superconductor heterostructure
We study the robustness of Majorana zero energy modes and minigaps of quasiparticle excitations in a vortex by numerically solving Bogoliubov-de Gennes equations in a heterostructure composed of an s-wave superconductor, a spin-orbit-coupled semiconductor thin film, and a magnetic insulator. This heterostructure was proposed recently as a platform for observing non-Abelian statistics and perfor...
متن کاملDoppler shift on local density of states and local impurity scattering in the vortex state
The vortex state thermal and transport properties of the high T c copper oxides can be understood in a d-wave gap model and are dominated by the extended quasiparticle states that exist along the nodal directions in momentum space. The Doppler shift on these states due to the circulating supercurrents around the vortex core, introduces new van Hove ridges into the energy dependent local density...
متن کاملElementary vortex pinning potential in superconductors with unconventional order parameter
The elementary vortex pinning potential is studied in unconventional superconductors within the framework of the quasiclassical theory of superconductivity. Numerical results are presented for d-, anisotropic s-, and isotropic s-wave superconductors to show explicitly that in unconventional superconductors the vortex pinning potential is determined mainly by the loss of the condensation energy ...
متن کامل