Magnetic-Field-Driven Electron Dynamics in Graphene
Magnetic-Field-Driven Electron Dynamics in Graphene
复制标题
石墨烯中的磁场驱动电子动力学
DOI：
10.1021/acs.jpclett.1c01020
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Kilin, D.
中科院分区：
文献类型：
--
作者：
Fatima, F.;Inerbaev, T;Xia, W;Kilin, D.
石墨烯表现出独特的光电性质，源于狄拉克点处的能带结构。它是研究外加磁场影响下电子和光学性质的理想模型结构。在石墨烯中，电场、激光脉冲和电压可以产生受动量色散影响的电子动力学。然而，在外加磁场下动量影响的电子动力学的计算建模仍然具有挑战性。在这里，我们进行计算建模的光激发电子动力学实现在石墨烯下施加磁场。我们的结果表明，磁场导致局部偏离动量守恒的电荷载流子。随着磁场强度的增加，电子几率分布的离域性增加，并形成类回旋加速器轨迹。我们的工作有助于理解动量分辨磁场对石墨烯非平衡性质的影响，这对于光电和光伏应用至关重要。
Graphene exhibits unique optoelectronic properties originating from the band structure at the Dirac points. It is an ideal model structure to study the electronic and optical properties under the influence of the applied magnetic field. In graphene, electric field, laser pulse, and voltage can create electron dynamics which is influenced by momentum dispersion. However, computational modeling of momentum-influenced electron dynamics under the applied magnetic field remains challenging. Here, we perform computational modeling of the photoexcited electron dynamics achieved in graphene under an applied magnetic field. Our results show that magnetic field leads to local deviation from momentum conservation for charge carriers. With the increasing magnetic field, the delocalization of electron probability distribution increases and forms a cyclotron-like trajectory. Our work facilitates understanding of momentum resolved magnetic field effect on non-equilibrium properties of graphene, which is critical for optoelectronic and photovoltaic applications.