Impurity scattering in metallic carbon nanotubes with superconducting pair potentials
نویسنده
چکیده
Effects of the superconducting pair potential on the impurity scattering processes in metallic carbon nanotubes are studied theoretically. The backward scattering of electrons vanishes in the normal state. In the presence of the superconducting pair correlations, the backward scatterings of electronand hole-like quasiparticles vanish, too. The impurity gives rise to backward scatterings of holes for incident electrons, and it also induces backward scatterings of electrons for incident holes. Negative and positive currents induced by such the scatterings between electrons and holes cancel each other. Therefore, the nonmagnetic impurity does not hinder the supercurrent in the regions where the superconducting proximity effects occur. Relations with experiments are discussed. E-mail address: [email protected]; URL: http://www.etl.go.jp/ ̃harigaya/ Corresponding address – 1 – PACS numbers: 72.80.Rj, 72.15.Eb, 73.61.Wp, 73.23.Ps
منابع مشابه
Impurity Scattering in Carbon Nanotubes with Superconducting Pair Correlations
Effects of the superconducting pair potential on the impurity scattering processes in metallic carbon nanotubes are studied theoretically. The backward scattering of electrons vanishes in the normal state. In the presence of the superconducting pair correlations, the backward scatterings of electronand hole-like quasiparticles vanish, too. The impurity gives rise to backward scatterings of hole...
متن کاملConductivity in Carbon Nanotubes with Aharonov–Bohm Flux
The Boltzmann conductivity is calculated for carbon nanotubes in the presence of an Aharonov–Bohm magnetic flux. Effects of impurity scattering are considered at low temperatures and those of electron– phonon scattering are considered at room temperature. Effects of strains and curvature manifest themselves as a prominent conductivity peak as a function of the flux. The appearance of the peak c...
متن کاملEffect of magnetic Gd impurities on the superconducting state of amorphous Mo-Ge thin films with different thickness and morphology
We studied the effect of magnetic doping with Gd atoms on the superconducting properties of amorphous Mo70Ge30 films. We observed that in uniform films deposited on amorphous Ge, the pair-breaking strength per impurity strongly decreases with film thickness initially and saturates at a finite value in films with thickness below the spin-orbit scattering length. The variation is likely caused by...
متن کاملPropagation of Cooper pairs in carbon nanotubes with superconducting correlations
Propagation of Cooper pairs in carbon nanotubes in the presence of superconducting correlations is studied theoretically. We find that negative and positive currents induced by impurity scatterings between electrons and holes cancel each other, and the nonmagnetic impurity does not hinder the supercurrent in the regions where the superconducting proximity effects occur. The carbon nanotube is a...
متن کاملCasimir Interactions Between Scatterers in Metallic Carbon Nanotubes
We study interactions between localized scatterers on metallic carbon nanotubes by a mapping onto a onedimensional Casimir problem. Backscattering of electrons between localized scattering potentials mediates long-range forces between them. We model spatially localized scatterers by local and nonlocal potentials and treat simultaneously the effects of intravalley and intervalley backscattering....
متن کامل