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Quantum Beat Spectroscopy of Excitons in Semiconductors

  • W. von der Osten
  • V. Langer
  • H. Stolz
Part of the NATO ASI Series book series (NSSB, volume 330)

Abstract

In this contribution, recent investigations are described in which quantum beat spectroscopy is employed to reveal and quantitatively characterize the coherence of exciton states in semiconductors and ionic crystals. Coherence in that case signifies the existence of a well-defined phase relationship between the time-dependent quantum mechanical wavefunctions. Following the creation of the exciton system in a coherent state by optical excitation with a short laser pulse, scattering will destroy the phase relation and, depending on the specific interactions, may lead to a rapid loss of coherence. Besides pure dephasing by elastic scattering, also energy relaxation by inelastic scattering destroys the coherence. In general, these processes advance simultaneously and finally are terminated by exciton recombination which takes the excited system back into the crystal ground state. Even though phase and energy relaxation in case of excitons are extremely fast proceeding on a pico- or subpicosecond time scale, the recent advances in ultrafast spectroscopy now allow to directly investigate the dynamics of these processes.

Keywords

Coherence Time Exciton State Beat Signal Quantum Beat Pure Dephasing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • W. von der Osten
    • 1
  • V. Langer
    • 1
  • H. Stolz
    • 1
  1. 1.Fachbereich PhysikUniversität-GH PaderbornPaderbornGermany

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