Abstract-Disturbing the coherent dynamics of an excitonic polarization with strong terahertz fields

M. J. Drexler, R. Woscholski, S. Lippert, W. Stolz, A. Rahimi-Iman, and M. Koch

https://journals.aps.org/prb/accepted/c907aY1bEf71ff4532829ec048ac14177c73bb7f9

We present a study based on combining Four-Wave-Mixing (FWM) and strong fields in the terahertz frequency range (THz) to monitor the time-evolution of a disturbed excitonic polarisation in a multiple quantum well system. Our findings not only confirm a lower field-dependent ionisation threshold for higher excitonic states but furthermore provide experimental evidence for intra-excitonic Rabi flopping in the time domain. These measurements correspond to the picture of a reversible and irreversible transfer as previously predicted by a microscopic theory.