期刊
PHYSICAL REVIEW X
卷 5, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.5.011012
关键词
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资金
- Singapore National Research Foundation [NRFF2012-02]
- Singapore MOE Academic Research Fund Tier 3 Grant [MOE2011-T3-1-005]
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.
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