Abstract
A new scheme is proposed for calculating excitation spectrum of a quantum dot expressed by the impurity Anderson model. It is based on the second order perturbation theory with respect to the Coulomb repulsion, but is modified so as to reproduce the correct atomic limit and to fulfil the Friedel sum rule. The magnetic field dependence of both the excitation spectra and the transport properties of a quantum dot is investigated. It is found that the zero bias peak in differential conductance splits under external magnetic field and that negative magnetoresistance will be observed at zero bias voltage in case of electron-hole asymmetry.
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