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Exciton dynamics studied via internal THz transitions

  • Author(s): Kaindl, R.A.;
  • Hagele, D.;
  • Carnahan, M.A.;
  • Lovenich, R.;
  • Chemla, D.S.
  • et al.
Abstract

We employ a novel, ultrafast terahertz probe to investigate the dynamical interplay of optically-induced excitons and unbound electron-hole pairs in GaAs quantum wells. Resonant creation of heavy-hole excitons induces a new low-energy oscillator linked to transitions between the internal exciton degrees of freedom. The time resolved terahertz optical conductivity is found to be a probe well suited for studies of fundamental processes such as formation, relaxation and ionization of excitons.

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