Abstract
Inelastic light scattering by inter-Landau-level excitations of the 2D electron gas in high-mobility GaAs structures in a perpendicular magnetic field was observed at the energies of the critical points in the mode dispersions. For Landau-level filling factors ν≥1, structure in the spectra indicates the excitonic binding and roton behavior predicted by the Hartree-Fock approximation. The large critical-point wave vectors, q≳(ħc/eB≳ , are probably accessible in resonant light scattering through the residual disorder that broadens the Landau levels.
- Received 19 August 1988
DOI:https://doi.org/10.1103/PhysRevLett.61.2701
©1988 American Physical Society