Local density of states for the corner geometry interface of d-wave superconductors within the extended Hubbard model

N. Stefanakis

doi:10.1103/PhysRevB.66.024514

← Back to search

Local density of states for the corner geometry interface of d-wave superconductors within the extended Hubbard model

N. Stefanakis

DOI 10.1103/PhysRevB.66.024514 · Physical Review B

T1

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

The spatial variations of the order parameter and the local density of states on the corner of s-wave or dx2−y2-wave superconductors, as well as in superconductor–insulator–normal metal interfaces, are calculated self-consistently by exact diagonalization of the Bogoliubov–de Gennes Hamiltonian within the two-dimensional extended Hubbard model. Due to the suppression of the dominant d-wave order parameter, the extended s-wave order parameter is induced near the surface, which alternates its sign for the topmost sites at adjacent edges of the lattice and decays to zero in the bulk. The presence of surface roughness results in the appearance of a zero-bias conduction peak near the corner surface which is lacking from the predictions of the quasiclassical theory.