The amplitudes of the peaks observe

The amplitudes of the peaks observed by Kopley et al.404 were found to be in agreement with this prediction, while the line shape of an isolated peak could be well described by a Lorentzian (see inset of Fig. 72). (Most of the peaks overlapped, hampering a line-shape analysis). In addition, they studied the effect of a strong magnetic field on the conductance peaks and found that the amplitudes of most peaks were substantially suppressed. This was interpreted as a reduction of the leak rates because of a reduced overlap between the wave functions on the impurity and the reservoirs. The amplitude of one particular peak was found to be unaffected by the field, indicative of a symmetrically placed impurity in the barrier (R = L), while the width of that peak was reduced, in agreement with Eq. (3.43). This study therefore exhibits many characteristic features of resonant tunneling through a single localized state.