Abstract
Using time resolved four-wave-mixing (FWM) spectroscopy and many-body theory we investigate the role of non-instantaneous collective and correlation effects in the dynamics of the cold two dimensional electron gas (2DEG) in large magnetic fields. We find a strong non-Markovian magnetoexciton dephasing and a strong time-dependent Coulomb coupling between the Landau levels (LL), governed by the dynamics of the inter-LL magnetoplasmon (MP) excitations. Our results show that ultrafast spectroscopy is a powerful tool for studying collective and strong correlation effects on the nanoscale.
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