A Mott insulator of fermionic atoms in an optical lattice

Robert Jördens, Niels Strohmaier, Kenneth Günter, Henning Moritz () and Tilman Esslinger
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Robert Jördens: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland
Niels Strohmaier: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland
Kenneth Günter: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland
Henning Moritz: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland
Tilman Esslinger: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland

Nature, 2008, vol. 455, issue 7210, 204-207

Abstract: Fermionic Mott insulator In a Mott insulator, suppression of conductivity occurs as a result of electron interactions. Proximity to this phase causes intriguing phenomena in fermionic condensed matter systems, most notably high-temperature superconductivity. The Hubbard model, which encompasses the essential physics of the Mott insulator, can be realized with quantum gases trapped in an optical lattice. Therefore, experimental tools developed in atomic physics can be used to study this regime. However, an atomic Mott insulator has so far been realized only with a gas of bosons, which lack the rich and peculiar nature of fermions. The authors report the formation of a Mott insulator of a repulsively interacting two-component Fermi gas in an optical lattice. The results pave the way for further studies of the Mott insulator, including spin-ordering and ultimately the question of d-wave superfluidity.

Date: 2008
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DOI: 10.1038/nature07244

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