Coherent control and polarization readout of individual excitonic states

B Patton, U Woggon, W Langbein

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Abstract

We present measurements and simulations of coherent control and readout of the polarization in individual exciton states. The readout is accomplished by transient four-wave mixing detected by heterodyne spectral interferometry. We observe Rabi oscillations in the polarization, which show half the period of the Rabi oscillations in the population. A decrease of the oscillation amplitude with pulse area is observed, which is not accompanied by a change in the dephasing time. This suggests the transfer of the excitation to other states as the origin of the Rabi-oscillation damping. Detuning of the excitation enables the control of the polarization in phase and amplitude and is in qualitative agreement with simulations for a two-level system. Additionally, simultaneous Rabi flopping of several spatially and energetically close exciton states is demonstrated.
Original languageEnglish
Article number266401
Number of pages4
JournalPhysical Review Letters
Volume95
Issue number26
DOIs
Publication statusPublished - 21 Dec 2005

Keywords

  • coherent control
  • exciton states
  • polarization
  • heterodyne spectral interferometry
  • Rabi oscillations
  • Rabi flopping

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