Abstract
Excitons and charged excitons (trions) are investigated in ZnSe-based quantum well structures with (Zn,Be,Mg)Se and (Zn,Mg)(S,Se) barriers by means of magneto-optical spectroscopy. Binding energies of negatively and positively charged excitons are measured as functions of quantum well width, and free carrier density and in external magnetic fields up to 47 T. The binding energy of shows a strong increase from 1.4 to 8.9 meV with decreasing quantum well width from 190 to The binding energies of are about 25% smaller than the binding energy in the same structures. The magnetic field behavior of and binding energies differ qualitatively. With growing magnetic field strength, increases its binding energy by 35–150%, while for it decreases by 25%. Zeeman spin splittings and oscillator strengths of excitons and trions are measured and discussed.
- Received 2 November 2001
DOI:https://doi.org/10.1103/PhysRevB.65.165335
©2002 American Physical Society