LOW-LYING QUASI-PARTICLE EXCITATIONS AROUND A VORTEX CORE IN QUANTUM LIMIT

Focusing on a quantum-limit behavior, we study a single vortex in a cl ean s-wave type-II superconductor by self-consistently solving the Bog oliubov-de Gennes equation. The discrete energy levels of the vortex b ound states in the quantum limit are discussed. The vortex core radius shrinks monotonically up to an atomic-scale length on lowering the te mperature T, and the shrinkage stops to saturate at a lower T. The pai r potential, supercurrent, and local density of states around the vort ex exhibit Friedel-like oscillations. The local density of states has particle-hole asymmetry induced by the vortex. These are potentially o bserved directly by scanning tunneling microscopy.