Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Focus Session: Nonlinear Dynamics of Nanomechanic Oscillators

DY 12.3: Vortrag

Montag, 5. September 2022, 16:15–16:30, H20

Tuning nonlinear damping in graphene nanoresonators by parametric-direct internal resonance — •Ata Keşkekler¹, Oriel Shohani², Martin Lee¹, Herre van der Zant¹, Peter Steeneken¹, and Farbod Alijani¹ — ¹TU Delft, Delft, The Netherlands — ²Ben-Gurion University of Negev, Beersheba, Israel

Micro/Nano-mechanical systems are utilized in many technologies and often have been used for their sensing capabilities. An ideal framework for sensitive nanomechanical devices is 2-D materials, and especially graphene, due to its exceptional mechanical, electrical and thermal properties. By their atomically thin nature, these systems are fundamentally nonlinear. In addition to their geometric nonlinearities, graphene membranes have shown nonlinear energy decay mechanisms. Nonlinear damping in these devices is a fundamental limitation to their sensing capabilities yet its full understanding is an open question. Among different dissipation mechanisms, an important factor that is hypothesized to affect damping properties of graphene nanodrums is the intermodal couplings. In this work, we study the nonlinear dynamics of a nanomechanical graphene resonator near its internal resonance condition to amplify the intermodal effects and uncover the physics between nonlinear damping and mode coupling. We observe a massive increase in damping in the vicinity of internal resonance that is followed by a bifurcation causing a dramatic increase of amplitude and resonance frequency. Our study opens up a route towards utilizing modal interactions and parametric resonance to realize resonators with engineered nonlinear dissipation over wide frequency range.