RESONANT TRANSMISSION THROUGH AN OPEN QUANTUM-DOT

We have measured the low-temperature transport properties of a quantum dot formed in a one-dimensional channel. In zero magnetic field this device shows quantized ballistic conductance plateaus with resonant tu nneling peaks in each transition region between plateaus. Studies of t his structure as a function of applied perpendicular magnetic field an d source-drain bias indicate that resonant structure deriving from tig htly bound states is split by Coulomb charging at zero magnetic field.