Coherent dynamics of exciton wavepackets in semiconductor heterostructures

J. Feldmann, M. Koch, E. O. Gobel, F. Jahnke, T. Meier, W. Schafer, P. Thomas, S. W. Koch, H. Nickel, S. Luttgen, W. Stolz

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The coherent dynamics of exciton wavepackets in (GaIn)As/GaAs as well as (GaIn)As/Ga(PAs) multiple quantum well structures is studied by means of transient four-wave mixing (FWM) experiments. The wavepackets are generated by simultaneous excitation of several exciton transitions with laser pulses of about 100 fs duration. The time-integrated FWM signals exhibit a pronounced modulation superimposed on the overall decay which can be attributed to the quantum interference of the different eigenstates. In the time-resolved FWM signals this interference is not present, reflecting the interplay between many-body Coulomb effects and inhomogeneous broadening. This experimental technique is then employed to extract the exciton binding energies in pseudomorphic symmetrically strained (GaIn)As/GaIPAs) with various In contents.

Original languageEnglish (US)
Article number018
Pages (from-to)1965-1971
Number of pages7
JournalSemiconductor Science and Technology
Volume9
Issue number11 S
DOIs
StatePublished - Dec 1 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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