Influence of illumination on the quantum mobility of a two-dimensional electron gas in Si 'sigma'-doped 'GaAs/In IND.0.15' 'Ga IND.0.85'As quantum wells - Cavalheiro, A; Silva, Euzi Conceição Fernandes da; Quivy, Alain André; Takahashi, E K; Martini, S; Silva, M J da; Meneses, E A; Leite, J. R. (Journal of Physics: Condensed Matter, 2003)