Topological phase transition measured in a dissipative metamaterial. (arXiv:1802.02243v1 [cond-mat.mes-hall])

We construct a metamaterial from radio-frequency harmonic oscillators, and
find two topologically distinct phases resulting from dissipation engineered
into the system. These phases are distinguished by a quantized value of bulk
energy transport. The impulse response of our circuit is measured and used to
reconstruct the band structure and winding number of circuit eigenfunctions
around a dark mode. Our results demonstrate that dissipation can lead to
topological transport in a much wider class of physical systems than considered
before.

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