Coulomb correlations in a two-dimensional electron gas in large magnetic fields

Academic Article

Abstract

  • We present an investigation of the dynamics of the inter-Landau-level (LL) excitations of a two-dimensional electron gas (2DEG) in large magnetic fields using coherent time-resolved nonlinear spectroscopy. The results are compared directly with measurements on undoped quantum wells. We observe time-dependent Coulomb coupling between the LL’s induced by the 2DEG that induces a large transfer of oscillator strength to the lowest LL. The time dependence of the nonlinear response reveals non-Markovian and memory effects of the photoexcited system that cannot be understood in terms of the random phase approximation. We introduce a theoretical approach that treats the interactions of the magnetoexcitons with the 2DEG excitations and qualitatively accounts for the most salient experimental results in terms of shake-up of the 2DEG. © 2002 The American Physical Society.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Fromer NA; Schüller C; Lai CW; Chemla DS; Perakis IE; Driscoll D; Gossard AC
  • Start Page

  • 1
  • End Page

  • 13
  • Volume

  • 66
  • Issue

  • 20