Observation of roton density of states in two-dimensional Landau-level excitations

A. Pinczuk, J. P. Valladares, D. Heiman, A. C. Gossard, J. H. English, C. W. Tu, L. Pfeiffer, K. West

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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 1/2 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(Latin small letter h with strokec/eB)-1/2106 cm-1, are probably accessible in resonant light scattering through the residual disorder that broadens the Landau levels.

Original languageEnglish (US)
Pages (from-to)2701-2704
Number of pages4
JournalPhysical review letters
Issue number23
StatePublished - 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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