Reflection-free one-way edge modes in a gyromagnetic photonic crystal

被引：1208

作者：

Wang, Zheng ^{[1
]}

Chong, Y. D. ^{[1
]}

Joannopoulos, John D. ^{[1
]}

Soljacic, Marin ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.100.013905

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We point out that electromagnetic one-way edge modes analogous to quantum Hall edge states, originally predicted by Raghu and Haldane in 2D photonic crystals possessing Dirac point-derived band gaps, can appear in more general settings. We show that the TM modes in a gyromagnetic photonic crystal can be formally mapped to electronic wave functions in a periodic electromagnetic field, so that the only requirement for the existence of one-way edge modes is that the Chern number for all bands below a gap is nonzero. In a square-lattice yttrium-iron-garnet crystal operating at microwave frequencies, which lacks Dirac points, time-reversal breaking is strong enough that the effect should be easily observable. For realistic material parameters, the edge modes occupy a 10% band gap. Numerical simulations of a one-way waveguide incorporating this crystal show 100% transmission across strong defects.

引用

页数：4

共 18 条

[1] CHERN NUMBER AND EDGE STATES IN THE INTEGER QUANTUM HALL-EFFECT [J].