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Combined 1D–2D intersubband excitations nd 1D single-particle spectrum in narrow quantum wires

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0039-6028(96)00536-5
Keywords
  • Gallium Arsenide
  • Light Scattering
  • Quantum Wells
  • Raman Scattering Spectroscopy
  • Semiconductor-Semiconductor Heterostructures
Disciplines
  • Mathematics
  • Physics

Abstract

Abstract Electronic excitations in AlGaAs-GaAs quantum wires have been investigated by means of resonant inelastic light scattering. Besides a rich spectrum of 1D electronic excitations at low frequencies we fin d at higher frequencies transitions in the regime of the original 2D intersubband excitations. Interestingly, we observe not only the original 2D intersubband excitations but additional modes ω k in polarized scattering geometry. The experimental observation is that the frequencies of these modes obey the relationship, ω 2 k = ω 2 2D + ω 2 1D, where ω 2D is the vertical intersubband plasmon frequency and ω 1D the lateral confined plasmon frequency. This relationship suggests that the additional modes are combined 2D-1D intersubband excitations of collective charge-density type.

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