论文标题
强大超快激光场中的双层石墨烯
Bilayer graphene in strong ultrafast laser fields
论文作者
论文摘要
从理论上讲，我们研究了Ultrastrong飞秒长的线性极化光脉冲与AB堆叠双层石墨烯的相互作用。脉冲从价激发电子到传导带，从而导致有限的传导带总体。这种电子的重新分布会导致电流产生，该电流可以通过脉冲的入射角来操纵。对于正常发病率，沿着向光脉冲极化的方向沿方向的电流为零。但是，层间对称性被有限的入射角分解，该角度导致电流沿垂直于脉冲极化的$ x $ - $ z $平面的方向诱导。我们表明，可以通过调谐激光脉冲的入射角来操纵这种电流的大小和方向以及沿该方向的电荷转移。此外，如果脉冲沿$ y $方向偏振，则系统的对称性禁止产生横向电流。
We theoretically investigate the interaction of an ultrastrong femtosecond-long linearly polarized optical pulse with AB-stacked bilayer graphene. The pulse excite electrons from the valence into the conduction band, resulting in finite conduction band population. Such a redistribution of electrons results in the generation of current which can be manipulated by the angle of incidence of the pulse. For the normal incidence, the current along a direction transverse to the polarization of the optical pulse is zero. However, the interlayer symmetry is broken up by a finite angle of incidence which causes induction of electric current in the direction perpendicular to the $x$-$z$ plane of polarization of the pulse. We show that the magnitude and the direction of such a current as well as charge transfer along this direction can be manipulated by tuning the angle of incidence of the laser pulse. Further, the symmetry of the system prohibits the generation of transverse current if the pulse is polarized along $y$-direction.
