Fig. 1. (a) Schematic diagram of experimental setup（In order to detect and control only one cantilever, the beam radius is focused to 3 μm by two micro-lenses）；(b) Thermal oscillation spectral density of the coupled cantilevers at various trapping powers

Fig. 2. (a) Phonon oscillation caused by the first-order LZS interference；(b) Relation between the driving amplitude and frequency of phonon oscillation（Experimental measurements (black dots) agree well with theoretical results calculated from (gray line)） （a）一阶LZS干涉导致的声子振荡；（b）声子振荡频率与驱动幅度的关系（实验测量结果（黑点）与理论计算的 （灰色实线）相符）

Fig. 3. Phonon oscillation caused by the second-order LZS interference (Gray dotted line represents the amplitude of phonon oscillation)

Fig. 4. Phonon oscillation based on the zero-order LZS interference. The experimentally measured amplitudes of (a) cantilever 1 and (b) cantilever 2，and the numerical calculated amplitudes of (c) cantilever 1 and (b) cantilever 2 at the resonant condition