TY - JOUR
T1 - Observation of 2D Fermionic Mott Insulators of K 40 with Single-Site Resolution
AU - Cheuk, Lawrence W.
AU - Nichols, Matthew A.
AU - Lawrence, Katherine R.
AU - Okan, Melih
AU - Zhang, Hao
AU - Zwierlein, Martin W.
N1 - Funding Information:
This work was supported by the NSF, AFOSR-PECASE, AFOSR-MURI on Exotic Phases of Matter, ARO-MURI on Atomtronics, a grant from the Army Research Office with funding from the DARPA OLE program, and the David and Lucile Packard Foundation. K.R.L. was supported by the Fannie and John Hertz Foundation and the NSF GRFP. M.A.N. was supported by the DoD through the NDSEG Fellowship Program.
Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/6/10
Y1 - 2016/6/10
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.116.235301
DO - 10.1103/PhysRevLett.116.235301
M3 - Article
C2 - 27341242
AN - SCOPUS:84974654773
SN - 0031-9007
VL - 116
JO - Physical review letters
JF - Physical review letters
IS - 23
M1 - 235301
ER -