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HL: Fachverband Halbleiterphysik
HL 7: Poster I
HL 7.39: Poster
Monday, March 27, 2023, 13:00–15:00, P2/EG
Dressed-state analysis of two-color excitation schemes — •Thomas Bracht1,2, Tim Seidelmann3, Yusuf Karli4, Florian Kappe4, Vikas Remesh4, Gregor Weihs4, Vollrath Martin Axt3, and Doris E. Reiter2 — 1Institut für Festkörpertheorie, WWU Münster, DE — 2Condensed Matter Theory, TU Dortmund, DE — 3Theoretische Physik III, Universität Bayreuth, DE — 4Institut für Experimentalphysik, Universität Innsbruck, AT
For coherent control of a few-level quantum emitter, typically pulses with an energy resonant to the transition energy are used, which requires sophisticated filtering of the signal. However, two-color excitation protocols were recently employed to circumvent the necessity for filtering.
Here I present an analysis of two-color excitation schemes, using the laser dressed states of the system. It can be shown, that the two-color excitation approach can be understood as a driving of transitions between the dressed states. We investigate how these transitions depend on the pulse parameters and explain how the different combinations of laser energies can excite the system. In addition to the results for a simple two-level system (2LS), we consider a three-level exciton-biexciton system (3LS) that is typically found in semiconductor quantum dots and often used to generate entangled photon pairs. While in the 2LS, we can give clear conditions for the applicability, in the 3LS, due to strong state mixing, the conditions are less obvious. Nonetheless, we can find regimes of parameters to drive the system into either the exciton or the biexciton in the 3LS.