Many body effects and internal transitions of confined excitons in GaAs and CdTe quantum wells

✍ Scribed by C.J. Meining; H.A. Nickel; A.B. Dzyubenko; A. Petrou; M. Furis; D.R. Yakovlev; B.D. McCombe

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 626 KB
• Volume: 127
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00576-3

✦ Synopsis

Many body effects contribute significantly to the energy states of electron -hole pairs confined in quantum wells in the presence of excess electrons. We present results of optically detected resonance spectroscopy of the internal transitions of photo-excited electron -hole pairs in the presence of excess electrons for GaAs QWs and CdTe QWs. Compared to the case of isolated negatively charged excitons, excess electrons produce a large blue shift of the internal transitions in modulation-doped GaAs quantum wells (QWs) for filling factor , 2, and similar effects are found in CdTe QWs. For filling factor .2 no internal transitions are observed. These measurements demonstrate the strong effects of electron -electron correlations on the internal transitions of charged excitons in these quasi-2D systems and the importance of magnetic translation invariance. In the presence of excess electrons, the observed internal transitions are those of a magnetoplasmon bound to a mobile valence band hole.