Spin-imbalance in a 2D Fermi-Hubbard system

Peter T. Brown, Debayan Mitra, Elmer Guardado-Sanchez, Peter Schauß, Stanimir S. Kondov, Ehsan Khatami, Thereza Paiva, Nandini Trivedi, David A. Huse, Waseem S. Bakr

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)1385-1388
Number of pages4
JournalScience
Volume357
Issue number6358
DOIs
StatePublished - Sep 29 2017

All Science Journal Classification (ASJC) codes

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    Brown, P. T., Mitra, D., Guardado-Sanchez, E., Schauß, P., Kondov, S. S., Khatami, E., Paiva, T., Trivedi, N., Huse, D. A., & Bakr, W. S. (2017). Spin-imbalance in a 2D Fermi-Hubbard system. Science, 357(6358), 1385-1388. https://doi.org/10.1126/science.aam7838