four-wave mixing;
biexciton;
trion;
dilute magnetic semiconductor;
spin;
D O I:
10.1016/j.physe.2003.12.081
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
Polarization-dependent four-wave-mixing femto-second spectroscopy has been performed on CdTe/Cd0.88Mn0.12Te quantum wells at low temperatures and in high magnetic fields. Two patterns of quantum beat have been observed one from an exciton-trion, and the other from an exciton-biexciton, depending on a choice of two-incident laser light polarization. The spectrally resolved four-wave-mixing signal showed characteristic spectra at the energy position of the charged exciton and the biexciton (singlet and triplet), respectively. (C) 2003 Elsevier B.V. All rights reserved.