Spectral flow in vortex dynamics of d-wave superconductors

Abstract

We calculate Ohmic and Hall flux flow conductivities in the mixed state of d-wave superconductors taking into account the spectral flow along the anomalous branch of the states bound to vortex cores. Three regimes of vortex dynamics are found. In the moderately clean limit the contribution of the spectral flow to the conductivities coincides with that for s-superconductors. In the superclean regime in low magnetic fields both Ohmic and Hall conductivities acquire relaxation-time-independent universal values. The contribution of the spectral flow in the superclean regime is suppressed in higher fields. At not too low temperatures the contribution of the states above the gap is important.