Optics and Spectroscopy

, Volume 109, Issue 3, pp 358–365 | Cite as

Transient interband light absorption by quantum dots: Degenerate pump-probe spectroscopy

  • M. Yu. Leonov
  • A. V. Baranov
  • A. V. Fedorov
Condensed-Matter Spectroscopy


The optical pump-probe method, which makes it possible to determine the energy relaxation rate for excited electron-hole pairs and excitons in semiconductor quantum dots (QDs), is theoretically described. A scheme in which the carrier frequencies of optical pump and probe pulses are close to resonance with the same interband transition in the QD electron subsystem (degenerate case) is considered. The pump-induced probe energy absorption is analyzed as a function of the delay time between the pump and probe pulses. It is shown that under certain conditions this dependence is reduced to monoexponential, whose exponent is proportional to the energy relaxation rate for the considered state of electron-hole pairs and excitons. The size dependence of the energy relaxation rate of the electron-hole pair states is modeled by the example of PbSe-based QDs, whose electron subsystem is in the strong-confinement regime.


Hole Pair PbSe Probe Pulse Exciton State Electron Subsystem 
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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • M. Yu. Leonov
    • 1
  • A. V. Baranov
    • 1
  • A. V. Fedorov
    • 1
  1. 1.St. Petersburg State University of Information Technologies, Mechanics, and OpticsSt. PetersburgRussia

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