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Instabilities near Ultrastrong Coupling in a Microwave Optomechanical Cavity

Das, SR and Majumder, S and Sahu, SK and Singhal, U and Bera, T and Singh, V (2023) Instabilities near Ultrastrong Coupling in a Microwave Optomechanical Cavity. In: Physical Review Letters, 131 (6).

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Official URL: https://doi.org/10.1103/PhysRevLett.131.067001


With artificially engineered systems, it is now possible to realize the coherent interaction rate, which can become comparable to the mode frequencies, a regime known as ultrastrong coupling (USC). We experimentally realize a cavity-electromechanical device using a superconducting waveguide cavity and a mechanical resonator. In the presence of a strong pump, the mechanical-polaritons splitting can nearly reach 81 of the mechanical frequency, overwhelming all the dissipation rates. Approaching the USC limit, the steady-state response becomes unstable. We systematically measure the boundary of the unstable response while varying the pump parameters. The unstable dynamics display rich phases, such as self-induced oscillations, period-doubling bifurcation, and period-tripling oscillations, ultimately leading to the chaotic behavior. The experimental results and their theoretical modeling suggest the importance of residual nonlinear interaction terms in the weak-dissipative regime. © 2023 American Physical Society.

Item Type: Journal Article
Publication: Physical Review Letters
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Electromechanical devices; Optomechanics; Superconducting resonators; Waveguides, Coherent interaction; Engineered systems; Interaction rate; Mechanical; Mechanical resonators; Mode frequencies; Optomechanical cavities; Polaritons; Strong pump; Waveguide cavity, Polariton, article; microwave radiation; oscillation; steady state
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 07 Nov 2023 05:40
Last Modified: 07 Nov 2023 05:40
URI: https://eprints.iisc.ac.in/id/eprint/83042

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