Resonant peaks in quantum Hall transport in quantum dot arrays

We study the resonant peaks in the low-temperature magneto-resistance measu red in open quantum dot arrays at high magnetic field. The peaks appear at the field where the innermost edge channel passing through a dot array begi ns to be depopulated. From the gate voltage dependence, the peaks shift to lower magnetic field along the depopulation field at the point contact regi on in the dot array. We discuss the possible origin considering the chargin g effect in small puddles at the point contact region. (C) 2001 Published b y Elsevier Science B.V.