Measurement of a topological edge invariant in a microwave network
| Autor: | Perry Ping Shum, Wenchao Hu, Kan Wu, Michael Pasek, Yidong Chong, Jason C. Pillay |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Scattering QC1-999 FOS: Physical sciences General Physics and Astronomy Topology Topological insulator Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Topological invariants Edge states Invariant (mathematics) Microwave Eigenvalues and eigenvectors Optics (physics.optics) Physics - Optics |
| Zdroj: | Physical Review X, Vol 5, Iss 1, p 011012 (2015) |
| Popis: | 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 non-zero 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, is discussed. 10 pages, 10 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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