Persistent current on a disordered mesoscopic ring with an embedded   quantum dot
  We calculate the ensemble averaged persistent current on disordered mesoscopic rings with an embedded quantum dot. We model the quantum dot as a single resonance and use Random Matrix Theory to model the impurities in the ring. Using Efetov's supersymmetry technique, we develop an analytical expression for the current. We find not only one, but two resonance peaks in the current. This is interpreted as quantum interference phenomenon. 
E.H. Martins Ferreira, M.C. Nemes, H.A. Weidenmueller