DENSITY OF ELECTRONS IN A LATERAL QUANTUM-DOT BY SEMICLASSICAL TRAJECTORY ANALYSIS

A semi-classical trajectory model is used to calculate the magneto-res istance of submicron-sized dots with entrance and exit quantum point c ontact leads. A comparison with experimental data allows the determina tion of the electron density and the mean free path for the confined r egions and shows that these parameters can differ from their equivalen t ''bulk'' values. It is found that for realistic geometries the calcu lated conductance is extremely sensitive to the angular spread of the collimated beam but depends only weakly on the effective width of the quantum point contacts.