The Chern-Simons invariant of the (2+1)D quantum state formed by a quenched 2D topological band is measured experimentally and takes quantized values near +1, -1, and 0.
Witten, Commun
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Measuring the Chern-Simons invariant in quantum gases
The Chern-Simons invariant of the (2+1)D quantum state formed by a quenched 2D topological band is measured experimentally and takes quantized values near +1, -1, and 0.