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Modal interaction in a carbon nanotube resonator [28]. (a) The resonant frequency of mode A shifts to lower frequencies when the RF signal of the second generator hits the resonance frequency of mode B. (b) At slightly higher gate voltage, the trend changes and modal interaction increases the resonant frequency of mode A. (c) Depending on the gate voltage, the intermodal coupling can induce either stiffness-softening or stiffness-hardening effect. (Online version in colour.)
