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In this presentation I will address the possibility to generate an acoustic frequency comb by self-induced parametric coupling of flexural modes in a micron-scale membrane resonator. We detect the flexural modes using an inductive detection scheme [1]. The frequency comb arises as the result of the formation of a limit cycle (LC) following a Hopf bifurcation. We employ a novel pump-noisy-probe technique to record which mechanical excitation sidebands merge at the bifurcation. By thorough theoretical modelling we reveal the mechanism for this comb generation and show that it does not result from locking or synchronizing pre-existing frequencies. Instead, the comb frequency arises from the nonlinear properties of the system and can continuously be tuned by the drive power, similar to the RIFF mechanism [2]. Instead, the comb frequency arises from the nonlinear properties of the system and can continuously be tuned by the drive power [3].
[1] F. Yang, M. Fu, B. Bosnjak, R. H. Blick, Y. Jiang and Elke Scheer, Phys. Rev. Lett. 127, 184301 (2021).
[2] J. S. Ochs, D. K. J. Boneß, G. Rastelli, M. Seitner, W. Belzig, M. I. Dykman, E. M. Weig, Phys. Rev. X 12, 041019 (2022).
[3] M. Fu, O. Ameye, F. Yang, J. del Pino, J. Košata, T. Heugel, O. Zilberberg, E. Scheer, Phys. Rev. Research 7, 033127 (2025).