Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving

Abstract

In the present molecular dynamics study, external ac driving is used at frequencies outside the phonon spectrum to excite gap DBs in uniformly strained graphene nanoribbon. Harmonic displacement or harmonic force is applied to a zigzag atomic chain of graphene. In the former case non-propagating DBs are excited on the atoms next to the driven atoms, while in the latter case the excited DBs propagate along the nanoribbon. The energy transfer along the nanoribbon assisted by the DBs is investigated in detail and the differences between harmonic displacement driving and harmonic force driving are discussed. It is concluded that the amplitude of external driving at out of phonon spectrum frequencies should not necessarily be large to obtain a noticeable energy transfer to the system. Overall, our results suggest that external harmonic driving even at relatively small driving amplitudes can be used to control excitation of DBs and consequently the energy transfer to the system.

9 pages, 9 figures, submitted to Phys. Rev. B at 09/13/2016

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Cited by in corpus (6)

• Effect of discrete breathers on the specific heat of a nonlinear chain
• Effect of discrete breathers on macroscopic properties of the Fermi-Pasta-Ulam chain
• Discrete breathers assist energy transfer to ac driven nonlinear chains
• Interaction of phonons with discrete breather in strained graphene
• Rotobreathers in a chain of coupled elastic rotators
• First-principles derived force field for h-BN monolayer nanostructures: Applications to sheets, nanotubes and nanotori