Ultrafast Auger spectroscopy in strong magnetic field

Summary form only given. We address the role of many-body correlations originating from the inter-LL (Landau level) processes in QWs in strong field. In the linear optical response, the processes involving transitions between different LLs are suppressed provided that the magnetic field is strong enough. However, in the nonlinear response, the situation is completely different. In this case, there are inter-LL processes involving two photoexcited electrons - Auger processes - which remain unsuppressed even at strong magnetic fields. Our main observation is that the Auger processes should play the dominant role in the nonlinear optical spectroscopy in strong magnetic field. We perform numerical calculations for the third-order four-wave-mixing polarization which incorporate the Auger processes nonperturbatively.