Direct numerical demonstration of sign-preserving quasiparticle interference via an impurity inside a vortex core in an unconventional superconductor
Yuki Nagai, Noriyuki Nakai, Masahiko Machida
DOI 10.1103/PhysRevB.85.092505 · Physical Review B
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Abstract
We perform large-scale self-consistent numerical calculations, solving the Bogoliubov-de Gennes (BdG) equations in the magnetic field together with random impurities to directly demonstrate the typical quasiparticle interference (QPI) in the presence of vortices as observed by scanning tunneling microscopy and spectroscopy experiments in unconventional superconductors. The calculations reveal that the vortex itself never works as a scatter, causing the QPI pattern, but the vortex core containing impurity brings about the enhancement of the sign-preserving QPI peaks. Its origin is Andreev-bound states distorted by impurity, and all the measurement findings are consistently explained by the scenario based on the numerical results.
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