Luan Jianli, Li Shangyang, Ma Tianxing, Wang Li-Gang
Department of Physics, Beijing Normal University, Beijing 100875, People's Republic of China.
J Phys Condens Matter. 2018 Oct 3;30(39):395502. doi: 10.1088/1361-648X/aadbe0. Epub 2018 Aug 21.
New Dirac points may appear when periodic potentials are applied to graphene, and there are many interesting effects near them. Here we investigate the Zitterbewegung effect of fermions described by a Gaussian wave packet in graphene superlattice near these points. The Zitterbewegung near different Dirac points has similar characteristics, while fermions near new ones have different group velocities in both x- and y-direction, which causes the different properties of the Zitterbewegung near them. We also investigate the Zitterbewegung effect influenced by multi Dirac points, and get the evolution with changing potential. Our results suggest that graphene superlattice may provide an appropriate system to study the Zitterbewegung effect near new Dirac points experimentally.
当对石墨烯施加周期性势时，可能会出现新的狄拉克点，并且在它们附近存在许多有趣的效应。在这里，我们研究了在这些点附近的石墨烯超晶格中由高斯波包描述的费米子的颤动效应。不同狄拉克点附近的颤动效应具有相似的特征，而新狄拉克点附近的费米子在x和y方向上具有不同的群速度，这导致它们附近颤动效应的不同性质。我们还研究了多狄拉克点影响的颤动效应，并得到了随势变化的演化。我们的结果表明，石墨烯超晶格可能提供一个合适的系统，用于通过实验研究新狄拉克点附近的颤动效应。
