Disorder-induced enhancement of the persistent current for strongly   interacting electrons in one-dimensional rings
  We show that disorder increases the persistent current of a half-filled one-dimensional Hubbard-Anderson ring at strong interaction. This unexpected effect results from a perturbative expansion starting from the strongly interacting Mott insulator ground state. The analytical result is confirmed and extended by numerical calculations. 
Elise Gambetti-C\'esare, Dietmar Weinmann, Rodolfo A. Jalabert,   Philipp Brune