Ultrafast coherent control and destruction of excitons in quantum wells
Ultraschnelle kohärente Kontrolle und Zerstörung von Exzitonen in Quantenfilmen
We demonstrate the coherent destruction of photogenerated excitons in semiconductor quantum wells within a few hundred ferntoseconds of their excitation. Coherent control of carrier dynamics is achieved with phase-locked pairs of 100 fs infrared pulses. The technique induces an optical response which is faster than the inverse of the exciton linewidth superseding Fourier limits for a single pulse. Energy selectivity enables the coherent transfer of angular momentum between hole states. Such phase-tailored pulse trains can be utilized to investigate the generation process and intermediate virtual states in quantum structures.