CAPACITANCE OF ANISOTROPIC QUANTUM DOTS

The many-electron ground states in anisotropic parabolic quantum dots are investigated, by means of an unrestricted Hartree-Fock method. Fro m the total energy, both the chemical potential and the differential c apacitance of quantum dots are calculated. The effect of the shell str ucture due to quantization appears clearly in the chemical potential a nd the capacitance. The difference of the calculated differential capa citance from the classical one is caused by both the exchange interact ion and the quantization. As the vertical extent of a dot increases fr om two-dimensional limit, the change of capacitance is small owing to cancellation between changes of Hartree term and exchange term, except at special number of electrons. (C) 1997 Academic Press Limited.