We investigate light-induced persistent resonance frequency shift on MoS₂ mechanical resonators towards optically tunable nano-electro-mechanical systems with optical memory function. After the termination of light irradiation, the resonance frequency shifts downwards and the downshift is maintained for more than 20min. This behavior is induced by trapped photogenerated holes at defects or contamination on MoS₂ similar to the persistent photoconductivity. The trapped holes screen the electrostatic force acting on MoS₂, which results in the reduction of the tension of MoS₂. The downshift can be eliminated by applying the excess voltage pulse to MoS₂ to induce Joule heating.

我们调查光诱导的MoS ₂机械共振器上的持久共振频率向具有光学记忆功能的光学可调纳米电子机械系统的位移。光照射终止后，共振频率向下移动，降档保持20分钟以上。这种行为是由于在MoS ₂上存在缺陷或受污染而被捕获的光生空穴引起的，类似于持久的光电导性。捕获的孔屏蔽了作用在MoS ₂上的静电力，这导致MoS ₂的张力降低。通过向MoS ₂施加过量的电压脉冲以引发焦耳热，可以消除降档。