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HL: Fachverband Halbleiterphysik

HL 41: Focus Session: Nanomechanical Systems for Classical and Quantum Sensing III (joint session HL/DY/TT/QI)

HL 41.8: Talk

Thursday, March 21, 2024, 12:45–13:00, EW 202

Optomechanical acceleration beats in confined polariton condensates — Alexander Kuznetsov, Klaus Biermann, and •Paulo Ventura Santos — Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5-7, 10117 Berlin, Germany

High-frequency optomechanics involving optoelectronic systems with long temporal coherences enable access to the regime of non-adiabatic modulation, where the optomechanical modulation quantum ℏΩ_M exceeds the typical energy decoherence rate of the optoelectronic resonances. Characteristic for this regime is the appearance of modulation sidebands around the optoelectronic resonance line displaced by energy multiples mΩ_M,(m=0,±1,…) with amplitude and number determined by the energy modulation amplitude Δ E_M. Here, we experimentally demonstrate a novel regime of temporal coherence invoked by the harmonic modulation of an optomechanical resonance at extreme energy modulation amplitudes Δ E_M/(ℏΩ_M)>150. We show that the resonance energy of a confined exciton-polariton Bose-Einstein condensate harmonically driven at these high relative modulation amplitudes exhibit temporal correlations with time-scales much shorter than the modulation period [Kuznetsov et al., DOI:10.21203/rs.3.rs-3197243/v1]. These correlations manifest themselves as comb of spectral resonances with energy scale determined by the ratio Δ E_M/(ℏΩ_M). We show that they arise from accelerated rates of energy change during the harmonic cycle and are, thus, termed the acceleration beats.

Keywords: optomechanics; polariton; Bose-Einstein condensates; Surface acoustic waves