Surface superconductivity in multilayered rhombohedral graphene:   Supercurrent
  The supercurrent for the surface superconductivity of a flat-band multilayered rhombohedral graphene is calculated. Despite the absence of dispersion of the excitation spectrum, the supercurrent is finite. The critical current is proportional to the zero-temperature superconducting gap, i.e., to the superconducting critical temperature and to the size of the flat band in the momentum space. 
N.B. Kopnin
cond-mat.supr-con