Electrical and Computer Engineering | Electromagnetics and Photonics | Engineering Physics | Physical Chemistry
The interplay of strong interactions and magnetic fields gives rise to unusual forms of superconductivity and magnetism in quantum many-body systems. Here, we present an experimental study of the two-dimensional Fermi-Hubbard model—a paradigm for strongly correlated fermions on a lattice—in the presence of a Zeeman field and varying doping. Using site-resolved measurements, we revealed anisotropic antiferromagnetic correlations, a precursor to long-range canted order. We observed nonmonotonic behavior of the local polarization with doping for strong interactions, which we attribute to the evolution from an antiferromagnetic insulator to a metallic phase. Our results pave the way to experimentally mapping the low-temperature phase diagram of the Fermi-Hubbard model as a function of both doping and spin polarization, for which many open questions remain.
Peter Brown, Debayan Mitra, Elmer Guardado-Sanchez, Peter Schauß, Stanimir Kondov, Ehsan Khatami, Thereza Paiva, Nandini Trivedi, David Huse, and Waseem Bakr. "Spin-imbalance in a 2D Fermi-Hubbard system" Science (2017): 1385-1388. https://doi.org/10.1126/science.aam7838
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This is the Preprint titled "Observation of canted antiferromagnetism with ultracold fermions in an optical lattice" of an article that was published in Science, volume 357, issue 6358, 2017. The Version of Record is available online at this link.
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