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We perform large-scale numerical calculations self-consistently solving theBogoliubov-de Gennes (BdG) equations in the magnetic field together with randomimpurities to directly demonstrate the typical quasi-particle interference(QPI) in the presence of vortices as observed by scanning tunnelingmicroscopy/spectroscopy experiments in unconventional superconductors. Thecalculations reveal that vortex itself never works as a scatter causing the QPIpattern but vortex core containing impurity brings about the enhancement of thesign-preserving QPI peaks. Its origin is Andreev bound-states distorted byimpurity, and all the measurement findings are consistently explained by thescenario based on the numerical results.

Direct Numerical Demonstration of Sign-preserving Quasiparticle Interference via Impurity inside Vortex Core in Unconventional Superconductors