Giant Nernst and Hall effects due to chiral superconducting fluctuations

Abstract

We consider the Nernst and Hall effects in the fluctuation regime of chiral superconductors above transition temperatures, that are raised not by the conventional Lorentz force but by a mechanism that is an analog of the anomalous Nernst or Hall effects, i.e., asymmetric scattering due to chiral superconducting fluctuations. It is found that these effects can be gigantic for cleaner samples compared to conventional ones, exhibiting qualitatively distinct behavior. The results provide systematic and comprehensive understanding for recent experimental observations of the Nernst effect in a clean URu2Si2 sample, which is suggested to be a chiral superconductor.