anything, as long as it's small

Young's modulus and thermal expansion of tensioned graphene membranes

Isaac R. Storch, Roberto De Alba, Vivekananda P. Adiga, T. S. Abhilash, Robert A. Barton, Harold G. Craighead, Jeevak M. Parpia, and Paul L. McEuen

Phys. Rev. B 98, 085408 (2018)