Observation of 2D fermionic Mott insulators of $^{40}$K with single-site resolution

Autor:	Cheuk, Lawrence W., Nichols, Matthew A., Lawrence, Katherine R., Okan, Melih, Zhang, Hao, Zwierlein, Martin W.
Rok vydání:	2016
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Statistical Mechanics Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. Lett. 116, 235301 (2016)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.116.235301
Popis:	We report on the site-resolved observation of characteristic states of the two-dimensional repulsive Fermi-Hubbard model, using ultracold $^{40}$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 $0.99(6)\,k_B$ indicate that nearest-neighbor antiferromagnetic correlations should be detectable using spin-sensitive imaging. Comment: Updated text and citations
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1604.00096 Zobrazit plný text záznamu View this record from Arxiv