Quantum degenerate Fermi gas in an orbital optical lattice

• URL: http://arxiv.org/abs/2106.12241v1
• Date: Wed, 23 Jun 2021 08:59:57 GMT
• Title: Quantum degenerate Fermi gas in an orbital optical lattice
• Authors: M. Hachmann, Y. Kiefer, J. Riebesehl, R. Eichberger, A. Hemmerich
• Abstract summary: Spin-polarized samples and spin mixtures of quantum degenerate fermionic atoms are prepared in selected excited Bloch bands of an optical chequerboard square lattice. For the spin-polarized case, extreme band lifetimes above $10,$s are observed, reflecting the suppression of collisions by Pauli's exclusion principle. For spin mixtures, lifetimes are reduced by an order of magnitude by two-body collisions between different spin components, but still remarkably large values of about one second are found.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spin-polarized samples and spin mixtures of quantum degenerate fermionic atoms are prepared in selected excited Bloch bands of an optical chequerboard square lattice. For the spin-polarized case, extreme band lifetimes above $10\,$s are observed, reflecting the suppression of collisions by Pauli's exclusion principle. For spin mixtures, lifetimes are reduced by an order of magnitude by two-body collisions between different spin components, but still remarkably large values of about one second are found. By analyzing momentum spectra, we can directly observe the orbital character of the optical lattice. The observations demonstrated here form the basis for exploring the physics of Fermi gases with two paired spin components in orbital optical lattices, including the regime of unitarity.

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