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Conversion of heat-flux, from a steady state temperature difference, tomechanical vibration is demonstrated in graphene nanoribbons using directnon-equilibrium molecular dynamics (NEMD). We observe that this effect isindependent of the method of imposing the temperature gradient, heat flux aswell as imposed boundary conditions. We propose that simply dividing thenanoribbon in long and short sections using a partially immobilized area willlead to excitation of long-wavelength vibrations in the long section of thenanoribbon. This results in simpler architectures for heat-to-vibrationconverter devices based on graphene or other 2D materials. Furthermore weobserve that applying tensile axial strain to nanoribbons, facilitatesvibrational instability by reducing the required threshold heat flux ortemperature gradient. Finally, we discuss the role played by Umklapp scatteringfor physical mechanisms behind these observations.

Heat-to-Mechanical Energy Conversion in Graphene: Manifestation of Umklapp Enhancement with Strain