论文标题
石墨烯的声学模式的非谐度
Anharmonicity of the acoustic modes of graphene
论文作者
论文摘要
在有限温度下，通过谐波线性响应（HLR）方法研究了石墨烯的声音声子分散的非谐性。这是一种基于系统对施加力的线性响应的非扰动方法，源自平衡计算机模拟。在室温下的长波长极限中分析了Anharmonic Shings，重点是施加的拉伸或压缩内应力的效果。将模拟结果与可用的分析模型进行比较，该模型基于一阶扰动理论或异常指数的描述。模拟对扰动方法的期望显示了更好的一致性。简要审查了温度和零点振动对石墨烯的原声外静脉移动的影响。
The anharmonicity of the acoustic phonon dispersion of graphene has been studied by the harmonic linear response (HLR) approach at finite temperature. This is a non-perturbative method based on the linear response of the system to applied forces, as derived from equilibrium computer simulations. Anharmonic shifts are analyzed in the long-wavelength limit at room temperature, with emphasis in the effect of applied tensile or compressive in-plane stress. The simulation results are compared with available analytical models, based either on first-order perturbation theory or on a description by anomalous exponents. The simulations show better agreement to the expectations of the perturbational approach. The effect of temperature and zero-point vibrations on the acoustic out-of-plane anharmonic shifts of graphene are briefly reviewed.
