Multibranched parametric resonance and swallowtail catastrophe in electromechanical oscillators with nonlinear friction

• URL: http://arxiv.org/abs/2607.27242v1
• Date: Mon, 27 Jul 2026 05:03:15 GMT
• Title: Multibranched parametric resonance and swallowtail catastrophe in electromechanical oscillators with nonlinear friction
• Abstract summary: Parametric resonance underpins the operation of a wide range of physical systems.<n>We show that conventional controlled nonlinear friction can induce the coexistence of two distinct pairs of period-two states.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Parametric resonance underpins the operation of a wide range of physical systems, from nanomechanical resonators to quantum-information systems and Ising machines. As an archetypal class of driven-dissipative systems, parametric oscillators are generally expected to exhibit a single pair of stable period-two states with opposite phases. This bistable behavior enables both the simulation of spin Hamiltonians and the preparation of superconducting cat states. Whether multiple pairs of such states can coexist in a single oscillator, however, remains an open question. Here, we show experimentally and theoretically that conventional controlled nonlinear friction can induce the coexistence of two distinct pairs of period-two states in a micromechanical oscillator. The friction is implemented via a canonical approach, utilizing a drive-induced resonant coupling that transfers two vibrational quanta from the oscillatory mode to a faster decaying mode. We demonstrate that the onset of multistability is governed by a swallowtail catastrophe and quantitatively map the associated bifurcation structure. Our results broaden the understanding of parametric resonance and establish micro- and nano-mechanical oscillators as a versatile platform for studying catastrophe theory and multistable nonequilibrium dynamics.

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