Observation of 2D fermionic Mott insulators of $^{40}$K with single-site resolution
Quantum Gases
2016-06-16 v3 Statistical Mechanics
Strongly Correlated Electrons
Abstract
We report on the site-resolved observation of characteristic states of the two-dimensional repulsive Fermi-Hubbard model, using ultracold K atoms in an optical lattice. By varying the tunneling, interaction strength, and external confinement, we realize metallic, Mott-insulating, and band-insulating states. We directly measure the local moment, which quantifies the degree of on-site magnetization, as a function of temperature and chemical potential. Entropies per particle as low as indicate that nearest-neighbor antiferromagnetic correlations should be detectable using spin-sensitive imaging.
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@article{arxiv.1604.00096,
title = {Observation of 2D fermionic Mott insulators of $^{40}$K with single-site resolution},
author = {Lawrence W. Cheuk and Matthew A. Nichols and Katherine R. Lawrence and Melih Okan and Hao Zhang and Martin W. Zwierlein},
journal= {arXiv preprint arXiv:1604.00096},
year = {2016}
}
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