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|Type:||Artigo de periódico|
|Title:||Exciton states and diamagnetic shifts in symmetric coupled double GaAs-Gal(1-x)Al(x)As quantum wells within the fractional-dimensional approach|
de Dios-Leyva, M
|Abstract:||We have extended the fractional-dimensional space approach to study exciton states and diamagnetic shifts in symmetric coupled double GaAs-Ga1-xAlxAs quantum wells. In this scheme, the fractional dimension is chosen using an analytical procedure, and the real anisotropic 'exciton + double quantum well' semiconductor system is mapped, for each exciton state, into an effective fractional-dimensional isotropic environment. We have peformed calculations within the fractional-dimensional space scheme for the binding energies of Is-like heavy-hole direct excitons and for the energy difference between 1s- and 2s-like direct heavy-hole exciton states in GaAs-Ga1-xAlxAs symmetric coupled double quantum wells. Also, theoretical results were obtained for the magnetic-field dependence of the Is-like heavy-hole exciton energy shift and for the exciton diamagnetic coefficient in quantum wells and symmetric coupled double quantum wells. Fractional-dimensional theoretical results are shown to be in good agreement with available experimental measurements and previous theoretical calculations.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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