title: Microscopic Observation of Pauli Blocking in Degenerate Fermionic Lattice Gases.
abstract: 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.
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Omran
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Boll
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
authors.forename: Timon A
authors.initials: TA
authors.lastname: Hilker
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
authors.forename: Katharina
authors.initials: K
authors.lastname: Kleinlein
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Salomon
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.|Ludwig-Maximilians-Universität, Fakultät für Physik, 80799 München, Germany.
authors.forename: Immanuel
authors.initials: I
authors.lastname: Bloch
authors.affiliation: Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Gross