Fig. 3: Nanomechanical and Raman vibrations measured from the 3 L WSe₂ resonator with d = 4 μm, using V_g = 3 V, and v_ac from 30 mV to 200 mV (Full data with v_ac from 5 mV to 200 mV are shown in Fig. S10).

a Select amplitude-frequency curves showing nanomechanical responses under different v_ac. The insets in (a) show vibrational amplitude of WSe₂ membrane as a function of v_ac at 11.02 MHz. b Select Raman spectra with the device driven at driving frequency 11.02 MHz, V_g = 3 V, showing E_2g¹ & A_1g and 2LA modes, when v_ac = 200 mV (red, device in nonlinear regime) and v_ac = 10 mV (blue, device in linear regime). Symbols are measured spectra data and dashed lines are fittings to the individual peaks, with solid lines being the sums. The insets in (b) show Raman peak shift ∆ω_E2g¹_{& A1g} (left) and ∆ω_2LA (right) as a function of v_ac at 11.02 MHz (indicated by colored triangles). The measurement conditions in (b) largely correspond to the symbols in (a)