Observation of 2D Fermionic Mott Insulators of K 40 with Single-Site Resolution

Author(s)
Cheuk, Lawrence W; Nichols, Matthew A; Lawrence, Katherine R; Okan, Melih; Zhang, Hao; ... Show more
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Abstract
© 2016 American Physical Society. We report on the site-resolved observation of characteristic states of the two-dimensional repulsive Fermi-Hubbard model, using ultracold K40 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 0.99(6)kB indicate that nearest-neighbor antiferromagnetic correlations should be detectable using spin-sensitive imaging.
Date issued
2016
URI
https://hdl.handle.net/1721.1/133902
Department
Massachusetts Institute of Technology. Department of Physics; MIT-Harvard Center for Ultracold Atoms; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Cheuk, L. W., et al. "Observation of 2d Fermionic Mott Insulators of K 40 with Single-Site Resolution." Physical Review Letters 116 23 (2016).
Version: Final published version
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