Calculation of divergent photon absorption in ultrathin films of a topological insulator

被引：21

作者：

Wang, Jing ^{[1
]}

Mabuchi, Hideo ^{[2
]}

Qi, Xiao-Liang ^{[1
]}

机构：

[1] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 19期

关键词：

SINGLE DIRAC CONE; GRAPHENE; SEMICONDUCTORS; SURFACE; BI2SE3;

D O I：

10.1103/PhysRevB.88.195127

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We perform linear and nonlinear photon absorption calculations in ultrathin films of a topological insulator on a substrate. Due to the unique band structure of the coupled topological surface states, novel features are observed for suitable photon frequencies, including a divergent edge singularity in the one-photon absorption process and a significant enhancement in the two-photon absorption process. The resonant frequencies can be controlled by tuning the energy difference and coupling the top and bottom surface states. Such unique linear and nonlinear optical properties make ultrathin films of topological insulators promising material building blocks for tunable high-efficiency nanophotonic devices.

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页数：6

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