INAS SELF-ASSEMBLED QUANTUM DOTS AS CONTROLLABLE SCATTERING CENTERS NEAR A 2-DIMENSIONAL ELECTRON-GAS

InAs self-assembled quantum dots are grown in the vicinity of a two-di mensional electron gas. Transport experiments show a progressive reduc tion of the electron mobility with increasing dot density, which indic ates the influence of the quantum dots on the electrical properties of the electron gas. A saturation of the mobility is observed for the hi ghest dot density samples. Transmission electron microscopy studies co nfirm. the existence of the dots and reveal the formation of a vertica lly aligned double dot. Calculations of scattering times due to repuls ive potentials are in agreement with the experimental data and suggest that the self-assembled quantum dots act as controllable scattering c enters that can be used to tailor the electron gas properties. [S0163- 1829(98)08027-8].