Nanoscale photocurrent imaging of local superconductivity

The iron-based superconductors have recently been found to be a promising candidate for topological superconductivity, which attracts significant research interests because of the possible realization of Majorana bound states and potential application in topological quantum computers. Here we study the photocurrent distribution in mechanically exfoliated superconductor thin film at the nanoscale using cryo-magneto scanning near-field optical microscopy (m-SNOM). Our near-field photocurrent mapping likely provides an insight of local superconductivity.