Fano-like electron–phonon interference in δ-doping GaAs superlattices

The interaction between electron excitations and LO phonons is studied by Raman seat tering in delta-doping GaAs superlattices. The Raman spectra measured close to the E-o + Delta(o) resonance of GaAs present Fano-like coupling of the LO phonons with the quasicontinuum single-particle electron excitations. Due to the self-consistent origin of the electron-energy spectrum in delta-doping superlattices the resonance of the Fano interference was found to be strongly dependent on the electron density as well as the excitation energy. (C) 1998 Academic Press Limited.