Binding energy of charged excitons in ZnSe-based quantum wells

G. V. Astakhov, D. R. Yakovlev, V. P. Kochereshko, W. Ossau, W. Faschinger, J. Puls, F. Henneberger, S. A. Crooker, Q. McCulloch, D. Wolverson, N. A. Gippius, A. Waag

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90 Citations (Scopus)

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 (X-) and positively (X+) 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 X- shows a strong increase from 1.4 to 8.9 meV with decreasing quantum well width from 190 to 29 Å. The binding energies of X+ are about 25% smaller than the X- binding energy in the same structures. The magnetic field behavior of X- and X+ binding energies differ qualitatively. With growing magnetic field strength, X- increases its binding energy by 35-150%, while for X+ it decreases by 25%. Zeeman spin splittings and oscillator strengths of excitons and trions are measured and discussed.

Original languageEnglish
Article number165335
Pages (from-to)1653351-16533517
Number of pages14880167
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number16
DOIs
Publication statusPublished - 15 Apr 2002
Externally publishedYes

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