Parametrization of S‐ and P‐Magnetoexcitons in Quantum Wells

Abstract

An analytical formula is proposed that describes magneto-optical data of heavy hole S-and P-magnetoexcitons in quantum wells quite well. The open coeficients in this formula have been fitted to numerically derived magnetoexciton energies. Experimental results for S -and P-magnetoexcitons are presented obtained from one-and two-photon excitation spectroscopy. It is possible to extract parameters for conduction band and valence band separately, while band mixing is taken into account by nonparabolicity parameters. The investigation shows that the dominant features of the spectra can be quantitatively described in the frame of a two-band model.Es wird eine analytische Formel vorgestellt, mit der S-und P-Magnetoexzitonen aus optischen Messungen gut beschrieben werden konnen. Die freien Parameter in dieser Formel wurden so gewahlt, daB sich eine optimale ubereinstimmung mit numerisch berechneten Magnetoexzitonenergien ergibt. Es werden experimentelle Ergebnisse zu S-und P-Magnetoexzitonen vorgestellt, die mit Ein-Photonenund Zwei-Photonen-Anregungsspektroskopie gemessen wurden. Damit ist es moglich, Parameter fur das Leitungsband und das Valenzband getrennt zu bestimmen. Die Mischung der Bander wird iiber Nichtparabolizitaten beriicksichtigt. Es zeigt sich, daB die dominierenden Ubergange in den Spektren quantitativ im Rahmen eines Zweiband-Modells beschrieben werden konnen.

Excitons with large binding energies in MgS/ZnSe/MgS and ZnMgS/ZnS/ZnMgS quantum wells

“…The magneto-exciton transitions are fitted using the model of Engbring and Zimmermann [25] that includes the effects of the confinement potential in the well, the Coulomb interaction and the magnetic field. The 1s exciton states remain nearly unaffected by the magnetic field as the carriers are tightly bound and the Coulomb interaction dominates over the magnetic field effects.…”

Magneto-optical studies of excitons inZn1−xCdPuls1, Rossin2, Henneberger3 et al. 1996Phys. Rev. BSelf Cite431200View full textAdd to dashboardCite

“…10,13,14 Here, we summarize the general aspects and the specific approach used for the analysis of our experimental data. A single quantum well of width d w is considered.…”

“…Detailed information about the energetic structure and relevant band parameters is obtained by comparing the experimental data with the results of a numerical solution of the Schrödinger equation for the in-plane motion of the magnetoexcitons. 13 Complementary, we perform a variational treatment of the exciton ground state at zero magnetic field using a two-parameter trial function. The large splitting between the hh and lh exciton in Zn x Cd 1Ϫx Se/ZnSe QW's due to the combined action of quantum confinement and compressive in-plane strain justifies one to carry out both calculations in a two-band model.…”