PT Journal AU Löffler, W Tröndle, D Fallert, J Kalt, H Litvinov, D Gerthsen, D Lupaca-Schomber, J Passow, T Daniel, B Kvietkova, J Grün, M Klingshirn, aC Hetterich, M TI Electrical spin injection from ZnMnSe into InGaAs quantum wells and quantum dots SO Applied physics letters PY 2006 BP 062105 VL 88 LA english ER