外加交流激励离散呼吸子辅助应变石墨烯中的能量传递
Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving
摘要：
在本分子动力学研究中，外部交流驱动在声子谱之外的频率下用于激发均匀应变的石墨烯纳米颗粒中的间隙DB。将谐波位移或谐波力施加到石墨烯的锯齿形原子链。在前一种情况下，非传播的DBs被激发的原子旁边的驱动原子，而在后一种情况下，激发的DBs沿纳米取向传播。详细研究了DBs辅助下沿纳米尺度的能量传递，讨论了简谐位移驱动和简谐力驱动的区别。得出的结论是，在声子谱频率外的外部驱动的幅度不一定是大的，以获得显着的能量转移到系统。总的来说，我们的研究结果表明，即使在相对较小的驱动幅度的外部谐波驱动可以用来控制DBs的激励，从而能量转移到系统。
英文摘要：
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.
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