TUNNELING THROUGH QUANTUM-DOT SYSTEMS - A STUDY OF THE MAGNETOCONDUCTANCE FLUCTUATIONS

We report on a theoretical study of ballistic transport of electrons through two-probe quantum-dot systems in the tunnelling regime. Large aperiodic conductance fluctuations are observed as a function of the external magnetic field and the electron energy. We analyse the magnetic field correlation functions of the conductance fluctuation for both a stadium-shaped dot and a rectangular dot and find that they are qualitatively different. The correlation function of the stadium-shaped dot agrees well with the semi-classical chaotic-scattering theory, while that of the rectangular dot does not.