arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.5779cond-mat.mtrl-sci
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石墨烯中的反常光子辅助隧穿

Anomalous Photon-Assisted Tunneling in Graphene

Andrii Iurov, Godfrey Gumbs, Oleksiy Roslyak, Danhong Huang

摘要:

研究了圆偏振光作用下狄拉克电子通过势垒的传输。一个反常的光子辅助增强传输的预测和解释与著名的克莱因悖论。它表明,在无限石墨烯中的近正面碰撞的完美传输被抑制在电子的带隙的修饰状态,这是进一步伴随着作为远离正面碰撞的入射角的函数的峰的移位。此外,在没有势垒的情况下的完美传输部分地被照射的石墨烯中的光子诱导的间隙抑制。在考虑了势垒粗糙边缘或杂质散射的影响后,无势垒的完全透射被完全抑制,同时光子辅助的完全透射的能量范围也被减小。

英文摘要:

We investigated the Dirac electrons transmission through a potential barrier in the presence of circularly polarized light. An anomalous photon-assisted enhanced transmission is predicted and explained in a comparison with the well-known Klein paradox. It is demonstrated that the perfect transmission for nearly-head-on collision in an infinite graphene is suppressed in gapped dressed states of electrons, which is further accompanied by shift of peaks as a function of the incident angle away from the head-on collision. In addition, the perfect transmission in the absence of potential barrier is partially suppressed by a photon-induced gap in illuminated graphene. After the effect of rough edges of the potential barrier or impurity scattering is included, the perfect transmission with no potential barrier becomes completely suppressed and the energy range for the photon-assisted perfect transmission is reduced at the same time.

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