基于非平衡分子动力学方法,模拟研究了梯形、三角形和矩形热脉冲在石墨烯中的传播过程和规律.三种类型的温度脉冲采用直接速度修正法,通过调整对控温区原子施加的温度增量来实现.结果表明,热扰动在石墨烯中以有限的速度传播,并表现出明显的波动传递特征.热扰动在传播过程中激发出两道以不同速度传递的行波,一道波具有宏观动量,波速等于石墨烯声子群速度,为声波;另一道波是无宏观动量的热量的传播,波速是声速的1/x/3,为热波.研究还发现,热脉冲形状对热波现象的产生以及声波、热波的传播速度没有影响,但对其峰值温度影响显著.
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