We show that mechanical properties of atomically thin crystals, such as graphene and transition metal dichalco-genides can be efficiently controlled by optical excitation. Illumination by a plane electromagnetic wave with thefrequency close to plasmon or exciton resonance affects directly the membrane tension. Depending on the signof the frequency detuning from the resonance, the membrane is either stretched or crumpled by light. In thelatter case, the optomechanical crumpling force competes with the rigidity and the radiation pressure that tryto atten the membrane. When the excitation intensity surpasses the critical value, transition to the crumpledphase occurs.
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