Measurement of a Topological Edge Invariant in a Microwave Network

被引：185

作者：

Hu, Wenchao ^{[1
]}

Pillay, Jason C. ^{[2
]}

Wu, Kan ^{[3
]}

Pasek, Michael ^{[2
]}

Shum, Perry Ping ^{[1
]}

Chong, Y. D. ^{[1
,2
]}

机构：

[1] Nanyang Technol Univ, Ctr Disrupt Photon Technol, Singapore 637371, Singapore

[2] Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore

[3] Shanghai Jiao Tong Univ, State Key Lab Adv Opt Commun Syst & Networks, Dept Elect Engn, Shanghai 200240, Peoples R China

来源：

PHYSICAL REVIEW X | 2015年 / 5卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

QUANTIZED HALL CONDUCTANCE; STATES; PHASE;

D O I：

10.1103/PhysRevX.5.011012

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the measurement of topological invariants in an electromagnetic topological insulator analog formed by a microwave network, consisting of the winding numbers of scattering matrix eigenvalues. The experiment can be regarded as a variant of a topological pump, with nonzero winding implying the existence of topological edge states. In microwave networks, unlike most other systems exhibiting topological insulator physics, the winding can be directly observed. The effects of loss on the experimental results, and on the topological edge states, are discussed.

引用

页数：7

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