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Coulomb interactions in a dilute one-dimensional (1D) electron system in high quality cleaved-edge overgrown GaAs quantum wires are probed by optics experiments. Intra-subband collective excitation modes are observed in resonant inelastic light-scattering spectra. A sharp intra-subband excitation occurs close to the single particle transition energy. It is narrower and weaker than the plasmon band,...
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