Detecting the number of atoms per site of an optical lattice (brightness) allows the observation of a Fermi gas turning from (left) a strongly correlated metal into (right) a band insulator surrounded by a fermionic Mott insulator.

From the article:

Doublon-Hole Correlations and Fluctuation Thermometry in a Fermi-Hubbard Gas
Thomas Hartke, Botond Oreg, Ningyuan Jia, and Martin Zwierlein
Phys. Rev. Lett. 125, 113601 (2020)

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