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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Abstract
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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