标题： 具有周期性势的石墨烯中的波包动力学 显示英文标题

标题： Wave-packet dynamics in a graphene with periodic potentials

摘要： 我们采用狄拉克连续介质模型来研究石墨烯中具有周期性排列的圆形势台阶的电子波包传播。 利用分裂算符方法，计算了不同大小、高度和势垒间距下波包的时间演化。 使用分裂算符方法，针对各种势垒尺寸、高度和间距，计算了波包的时间演化。 我们发现，尽管石墨烯中存在显著的克莱因隧穿效应，但缺陷晶格的存在对波包的传播性质有显著影响。 例如，根据入射波包的高度和大小，透射概率可能会减少超过20%。 势垒极性的改变也对石墨烯中波包的透射概率有所贡献。 所得结果可为理解基于石墨烯的纳米器件中的载流子动力学提供有价值的见解。 显示英文摘要

摘要： We use the Dirac continuum model to study the propagation of electronic wave packets in graphene with periodically arranged circular potential steps. The time propagation of the wave packets are calculated using the split-operator method for different size, height and separation of the barriers. The time propagation of the wave packets is calculated using the split-operator method for various barrier sizes, heights, and separations. We found that, despite the pronounced Klein tunneling effect in graphene, the presence of a lattice of defects significantly impacts the propagation properties of the wave packets. For example, depending on the height and size of the incident wave packet, the transmission probability can decrease by more than 20\%. The alteration of the polarity of the potential barriers also contributes to the transmission probabilities of the wave packet in graphene. The obtained results could provide valuable insights into the fundamental understanding of charge carrier dynamics in graphene-based nanodevices.