Quasiparticle spectrum around a vortex line in a<i>d</i>-wave superconductor

Abstract

We study the quasiparticle spectrum around a single vortex line in a superconductor with ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ symmetry. For E(T), the density of states around a vortex exhibits a fourfold symmetry, in sharp constrast to a superconductor with s-wave symmetry. This should be readily seen in scanning tunneling microscopy experiments.