SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 10: Focus Session: Progress in Hybrid Phononic Quantum Technologies II

HL 10.4: Talk

Monday, March 27, 2023, 16:15–16:30, POT 151

Towards room temperature polaromechanics — •Ismael dP. Embid, Alexander S. Kuznetsov, Klaus Biermann, and Paulo V. Santos — Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany

Microcavity exciton-polaritons have emerged as a promising platform for novel solid-state devices ranging from low threshold lasers to quantum and classical simulators. The transition to a polariton condensate at high particle densities with long (ns) temporal coherence and enhanced sensitivity to vibrations has opened the way for polariton-based optomechanics in the GHz frequency domain [1]. Such highly coherent states have, however, so far been observed only at low temperatures (10K). Here, we show that long coherences can be maintained by confining the polariton condensates within µm-sized intracavity traps in (Al,Ga)As microcavities. In particular, we demonstrate temporal coherences in the GHz range up to temperatures exceeding 77K. Furthermore, we show that these condensates can be non-adiabatically modulated at these temperatures by electrically injected GHz phonons, leading to the formation of several phonon side bands. These results enable the generation of GHz optical frequency combs tunable by the electrical power, a relevant feature for the precise control of quantum states.

1. Kuznetsov et al., arXiv:2210.14331v1