Resonant saturation laser spectroscopy of a single self-assembled quantum dot

M. Kroner, S. Remi, A. Hoegele, S. Seidl, A. W. Holleitner, Richard Warburton, B. D. Gerardot, P. M. Petroff, K. Karrai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We performed high resolution resonant laser spectroscopy on a single self-assembled quantum dot (QD) at liquid He temperatures. We explore the two-level nature of the QD excitonic transition through the investigation of its behavior as a function of the laser power. The quantum ground state exciton absorption peak size diminishes with increasing power while its width increases. Fitting these dependencies to the predictions of a two-level atom model we extract unambiguously a radiative lifetime of 660 ps, a residual collisional broadening about 0.18 µ eV as well as the spectral fluctuation 1.3 µ eV. We find that at high power the line width of the exciton absorption is essentially given by the Rabi frequency. © 2007 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1994-1996
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume40
Issue number6
DOIs
Publication statusPublished - Apr 2008

Keywords

  • Laser spectroscopy
  • Power broadening
  • Quantum dot
  • Saturation spectroscopy
  • Two-level system

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