An electroacoustic cavity experiment directly measures the Zak phase of the SSH model and its next-nearest-neighbor extension, observing quantized phase accumulation of π and 2π for winding numbers 1 and 2.
Topological photonics
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Direct Measurement of Zak Phase and Higher Winding Numbers in an Electroacoustic Cavity System
An electroacoustic cavity experiment directly measures the Zak phase of the SSH model and its next-nearest-neighbor extension, observing quantized phase accumulation of π and 2π for winding numbers 1 and 2.