In this work, we presented a workable scheme to induce valley polarized current in a graphene junction with circularly polarized light and carrier mass. A non-linear effect of the circularly polarized light opens a gap in the Dirac cone. The mass term corresponding to a symmetry-breaking perturbation admits a band gap. The result shows that a valley-dependent energy gap can be opened in the presence of both circularly polarized light and carrier mass. We found that pure valley-polarized current is achieved in the valley-dependent energy gap. However, only one of the two modulations is present, no valley polarization can be generated. So the combination of the two modulations provides a new way to producing the pure valley current in the graphene system.

在这项工作中，我们提出了一个可行的方案，以圆偏振光和载流子质量在石墨烯结中感应谷值极化电流。圆偏振光的非线性效应打开了狄拉克锥的缝隙。对应于对称破坏扰动的质量项允许带隙。结果表明，在圆偏振光和载流子均存在的情况下，可以打开取决于谷的能隙。我们发现，在与谷有关的能隙中可获得纯的谷极化电流。然而，仅存在两种调制之一，不能产生波谷极化。因此，两种调制方式的组合提供了一种在石墨烯系统中产生纯谷电流的新方法。