Bruno-Alfonso, A.Hai, G. Q.Peeters, F. M.Yeo, T.Ryu, SRMcCombe, B. D.2014-05-202014-05-202001-10-29Journal of Physics-condensed Matter. Bristol: Iop Publishing Ltd, v. 13, n. 43, p. 9761-9772, 2001.0953-8984http://hdl.handle.net/11449/8559The 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.9761-9772engArtigo10.1088/0953-8984/13/43/307WOS:000172233300007Acesso restrito