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Nonlinearity in macroscopic mechanical system plays a crucial role in a widevariety of applications, including signal transduction and processing,synchronization, and building logical devices. However, it is difficult togenerate nonlinearity due to the fact that macroscopic mechanical systemsfollow the Hooke's law and response linearly to external force, unless strongdrive is used. Here we propose and experimentally realize a record-highnonlinear response in macroscopic mechanical system by exploring theanharmonicity in deforming a single chemical bond. We then demonstrate thetunability of nonlinear response by precisely controlling the chemical bondinginteraction, and realize a cubic elastic constant of \mathversion{bold}$2\times 10^{18}~{\rm N}/{\rm m^3}$, many orders of magnitude larger in strengththan reported previously. This enables us to observe vibrational bistatetransitions of the resonator driven by the weak Brownian thermal noise at 6~K.This method can be flexibly applied to a variety of mechanical systems toimprove nonlinear responses, and can be used, with further improvements, toexplore macroscopic quantum mechanics.

Generating Giant and Tunable Nonlinearity in a Macroscopic Mechanical Resonator from Chemical Bonding Force