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Binding Energy of Charged Excitons in ZnSe-based Quantum Wells | | G.V. Astakhov
; D.R. Yakovlev
; V.P. Kochereshko
; W. Ossau
; J. Puls
; F. Henneberger
; S.A. Crooker
; Q. McCulloch
; D. Wolverson
; N.A. Gippius
; W. Faschinger
; A. Waag
; | | Date: |
30 Nov 2001 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | 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 (X+) charged excitons are measured as functions of quantum well width, 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 29 A. The binding energies of X+ are about 25% smaller than the binding energy in the same structures. The magnetic field behavior of and X+ binding energies differ qualitatively. With growing magnetic field strength, 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. | | Source: | arXiv, cond-mat/0112002 | | Services: | Forum | Review | PDF | Favorites | |
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