Effects of Potential Fluctuations in Quantum Dot on Coulomb Oscillation

Abstract

We report how the conductance oscillations are varied when there are potential fluctuations in the semiconductor quantum dot. We find that the potential fluctuations lead to an irregular and a nonmonotonic change of the peak heights as a function of the gate voltage and each one increases or decreases as a function of temperature from peak to peak. The details are sensitive to the change of the randomness in the potential. We show that these anomalous features, although they differ from device to device, are observed universally when the fabrication is not complete.