Valley-contrastive election rules of a nonlinear optical transition in graphene with an energy gap
Valley-contrastive election rules of a nonlinear optical transition in graphene with an energy gap
复制标题
能隙石墨烯非线性光学跃迁的谷对比选择规则
DOI：
10.1103/physrevb.83.205404
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发表时间：
2011
影响因子：
3.7
通讯作者：
Jun-ichi Inoue
中科院分区：
文献类型：
--
作者：
A. Kanda;H. Goto;H. Tomori;S. Tanaka;Y. Ootuka;K. Tsukagoshi;H. Yoshioka;M. Hayashi;Jun-ichi Inoue
石墨烯中的谷自由度在材料的新特性中起着重要作用。对于能谱带隙的石墨烯，从理论上研究了非线性光学中的谷衬现象。使用Floquet方法和波矢点群理论，我们表明，光子共振激发的圆偏振光服从一个选择规则，这是互补的光子数的参与，手的圆偏振激光场，和谷指数。特别是，反演对称性破缺的一个标志是明确的选择规则。此外，带隙重正化作为一个影响所施加的激光场被发现也是谷依赖。
A valley degree of freedom in graphene has been playing significant roles in novel properties of the material. For graphene whose energy spectrum has a gap, valley-contrastive phenomena in nonlinear optics are theoretically studied. With the use of the Floquet method and the wave vector point group theory, we show that-photon resonant excitation by circularly polarized light obeys a selection rule that is complementary with respect to the number of the photons involved, handedness of the circularly polarized laser field, and the valley index. In particular, a hallmark of inversion symmetry breaking is clarified in the selection rule. Besides, the band gap renormalization as an influence of the applied laser field is found to be also valley dependent.