Author/Authors :
M.K.K. Nakaema، نويسنده , , M.J.S.P. Brasil، نويسنده , , F. Iikawa، نويسنده , , E. Ribeiro، نويسنده , , T. Heinzel، نويسنده , , K. Ensslin، نويسنده , , G. Medeiros-Ribeiro، نويسنده , , P.M Petroff، نويسنده , , J.A. Brum، نويسنده ,
Abstract :
InGaAs/GaAs self-assembled quantum dots in the presence of a two-dimensional electron gas were studied by micro-photoluminescence. Several sharp optical emission lines attributed to individual quantum dots were observed. These lines exhibit a blue shift and a broadening as the electron gas density is increased. We discuss the origin of the blue shift considering the variation of the built-in electric field in the asymmetric geometry of the dots. The observed broadening of the quantum dot emission lines is an indication of coupling between the two-dimensional electron gas and the electrons in the quantum dot.
