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Phys Rev Lett. 2015 Dec 31;115(26):263001. doi: 10.1103/PhysRevLett.115.263001. Epub 2015 Dec 23.

Microscopic Observation of Pauli Blocking in Degenerate Fermionic Lattice Gases.

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Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
Ludwig-Maximilians-Universität, Fakultät für Physik, 80799 München, Germany.


The Pauli exclusion principle is one of the most fundamental manifestations of quantum statistics. Here, we report on its local observation in a spin-polarized degenerate gas of fermions in an optical lattice. We probe the gas with single-site resolution using a new generation quantum gas microscope avoiding the common problem of light induced losses. In the band insulating regime, we measure a strong local suppression of particle number fluctuations and a low local entropy per atom. Our work opens a new avenue for studying quantum correlations in fermionic quantum matter both in and out of equilibrium.

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