Abstract
In GaAs, longitudinal-optical (LO) phonons are known to form coupled modes with the collective charge-density oscillations of a bulk electron plasma that are admixtures of electron and lattice oscillations.1 A similar coupling also occurs between LO phonons and the collective intersubband charge-density oscillations of quasi-two-dimensional (2D) electron systems that exist in modulationdoping GaAs-AlGaAs single heterostructures and quantum wells.2 In this paper we report resonant-Raman-scattering measurements demonstrating that in a GaAs δ-doped doping superlattice, coupled electron-phonon excitations have a different nature, i.e., a bulk LO one-phonon state dressed by a continuum of electron intersubband transitions.3
© 1993 Optical Society of America
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