Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 11: Materials and Devices for Quantum Technology I (joint session HL/QI)
HL 11.9: Vortrag
Montag, 18. März 2024, 17:30–17:45, EW 203
Coherence properties of exciton-polariton condensates in a long lifetime microcavity — •Yannik Brune1, Elena Rozas1, Kirk Baldwin2, Loren Pfeiffer2, David Snoke3, and Marc Aßmann1 — 1Department of Physics, Technische Universität Dortmund, Dortmund 44227, Germany — 2Department of Electrical Engineering, Princeton University, New Jersey 08544, USA — 3Department of Physics & Astronomy, University of Pittsburgh, Pittsburgh 15260, USA
The coherence properties of all-optically excited polariton condensates are typically hindered by the interactions with the concurrently excited incoherent background. We circumvent this restriction by using an annular shaped CW excitation beam, acting as a trapping potential in combination with long lifetime polaritons in a high Q-factor microcavity. Our approach enables the separation of the condensation area from the excitation area. The condensate properties are then examined using two-channel homodyne detection. This allows us not only to determine g2(0) but also access its Husimi-Q distribution and further properties like quantum coherence. These results provide a deeper understanding of the polariton condensate behavior beyond the condensation threshold. Our findings offer new insights into the use of CW pumped polariton condensates as ultralow threshold coherent light source.
Keywords: exciton polariton; polariton condensate; homodyne detection; strong coupling