MESOSCOPIC FLUCTUATIONS OF TUNNELING AND COTUNNELING IN QUANTUM DOTS

Recent measurements of mesoscopic tunneling and cotunneling fluctuatio ns in Coulomb blockaded ballistic quantum dots are presented. The stat istics and parametric fluctuations (as a function of magnetic field) o f Coulomb blockade peak heights are found to be consistent with random -matrix-theory predictions. Mesoscopic fluctuations of elastic cotunne ling, measured in the valleys between blockade peaks, are also present ed along with a semiclassical explanation of the observed enhancement of the magnetic field scale of cotunneling fluctuations compared to re sonant tunneling fluctuations. (C) 1998 Academic Press Limited.