Reversal of spin polarization direction in excitonic photoluminescence of AlGaAs A. M. Gilinsky, A. Winter, C. Mejía-García, H. Pascher, K. S. Zhuravlev, A. V. Efanov, E. V. Kozhemyakina, A. Amo and L. Viña EPL, 88 1 (2009) 17001 Published online: 09 October 2009 DOI: 10.1209/0295-5075/88/17001