Coherent Control and Polarization Readout of Individual Excitonic States

Article English OPEN
Langbein, Wolfgang Werner ; Patton, B. ; Woggon, U. (2005)
  • Publisher: American Physical Society
  • Related identifiers: doi: 10.1103/PhysRevLett.95.266401
  • Subject:
    arxiv: Condensed Matter::Quantum Gases | Condensed Matter::Mesoscopic Systems and Quantum Hall Effect | Condensed Matter::Other

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.
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