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|Type:||Artigo de evento|
|Title:||Exciton Mixing And Internal Transitions Of Neutral Magnetoexcitons In Quantum Wells|
|Abstract:||We present a theoretical investigation, in the effective-mass approximation., of exciton mixing and 1s - 2p± internal transitions of neutral magnetoexcitons in GaAs-Ga1-xAlxAs quantum wells. Theoretical results are obtained by diagonalizing the Kohn-Luttinger Hamiltonian in the presence of an external magnetic field along the growth direction of the quantum well, with mixing of appropriate light- and heavy-hole exciton states taken into account. We first perform the exciton calculations in the diagonal approximation, and take the exciton-envelope wave functions as linear combinations of products of hole and electron quantum-well states with Gaussian functions. Effects of exciton mixing are then calculated within perturbation theory. Theoretical results for the exciton internal transitions from 1s-like to 2p±-like magnetoexciton states in GaAs-Ga 1-xAlxAs quantum wells, with well widths of 80 Å, 100 Å, 125 Å, 150 Å and 200 Å, are found in overall agreement with optically detected resonance measurements. © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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