Transient coherent nonlinear spectroscopy of single quantum dots

Wolfgang Langbein, Brian Patton

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


We review our recent advances in four-wave mixing spectroscopy of single semiconductor quantum dots using heterodyne spectral interferometry, a novel implementation of transient nonlinear spectroscopy allowing the study of the transient nonlinear polarization emitted from individual electronic transitions in both amplitude and phase. We present experiments on individual excitonic transitions localized in monolayer islands of GaAs/AlAs quantum wells and in self-assembled CdTe/ZnTe quantum dots. We investigate the formation of the photon echo from individual transitions, both with increasing number of transitions in the ensemble, and in the presence of temporal jitter of the energy of a single transition. The detection of amplitude and phase of the signal allows the implementation of a two-dimensional femtosecond spectroscopy, in which mutual coherent coupling of single quantum dot states can observed and quantified.
Original languageEnglish
Article number295203
Pages (from-to)1-14
Number of pages14
JournalJournal of Physics: Condensed Matter
Issue number29
Publication statusPublished - 11 Jun 2007


  • nonlinear spectroscopy
  • heterodyne spectral interferometry
  • quantum dots
  • semiconductor quantum dots
  • excitonic transitions
  • quantum dot states


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