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HL: Fachverband Halbleiterphysik

HL 46: Ultra-fast phenomena

HL 46.10: Vortrag

Freitag, 5. April 2019, 12:00–12:15, H31

Modeling white light coherent 2D-spectroscopy on electrically pumped semiconductor nanostructures — •Aris Koulas-Simos^1,2, Mirco Kolarczik¹, Benjamin Lingnau², Bastian Herzog¹, Sophia Helmrich¹, Ulrike Woggon¹, Nina Owschimikow¹, and Kathy Lüdge² — ¹Institut für Optik und Atomare Physik, Technische Universität Berlin — ²Institut für Theoretische Physik, Technische Universität Berlin

We investigate the coherent coupling mechanisms of an electrically pumped InAs/InGaAs quantum dot-in-a-well semiconductor optical amplifier. We track the phase evolution of the system using white light coherent 2D spectroscopy with collinear pulses and electronic frequency filtering. In the experiment, we observe signatures of the quantum dot ground and excited state and a coupling between them. Interestingly, we also observe the existence of crossed excitons, i.e. coupling of states with different dimensionality. Our observations can be described using a theoretical model based on the Maxwell Bloch equations, where we incorporate the local charge carrier and polarisation dynamics microscopically. Similar to a heterodyne experiment, we vary the phase of both the pump and probe pulse, which allows us to distinguish the different bands of the outcoming signal and to extract a 2D spectrum corresponding to the rephasing sideband.