High-energy transitions of shallow magnetodonors in a GaAs/Al0.3Ga0.7As multiple quantum well
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Data
2001-10-29
Autores
Bruno-Alfonso, A.
Hai, G. Q.
Peeters, F. M.
Yeo, T.
Ryu, SR
McCombe, B. D.
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Iop Publishing Ltd
Resumo
The high-energy states of a shallow donor in a GaAs/Ga0.7Al0.3As multiple-quantum-well structure subjected to a magnetic field in the growth direction are studied both theoretically and experimentally. Effects due to higher confinement subbands as well as due to the electron-phonon interaction are investigated. We show that most of the peaks in the infrared photoconductivity spectrum are due to direct transitions from the ground state to the m = +/-1 magnetodonor states associated with the first subband, but transitions to the m = +/-1 states of the third subband are also apparent. The remaining photoconductivity peaks are explained by phonon-assisted impurity transitions.
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Journal of Physics-condensed Matter. Bristol: Iop Publishing Ltd, v. 13, n. 43, p. 9761-9772, 2001.