SIZE-DEPENDENT EFFECTS ON THE MAGNETOTRANSPORT FLUCTUATIONS OF SQUAREQUANTUM DOTS

Recently, experimental studies of magnetotransport in nominally square quantum dots have revealed a high degree of periodicity in the conduc tance fluctuations, with only a few apparently harmonically related fr equencies dominating the power spectra. Analysis of dots of different sizes has revealed that there are unresolved issues regarding the scal ing of the dominant frequency of the fluctuations. The experimental da ta appear to suggest that the dominant frequency scales with A(1/2), w here A is the area of the dot. On the other hand, a semiclassical anal ysis of periodic orbits suggests that the scaling should be with area. In this paper, we attempt to resolve this issue by simulating dots of many different sizes using both quantum mechanical and classical appr oaches.