Rice University

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Seminar

Physics & Astronomy

Speaker: Waseem Bakr
Princeton University

AMO - SPIN IMBALANCE IN A 2D FERMI-HUBBARD SYSTEM

Thursday, March 23, 2017
4:00 PM  to 5:00 PM

300  Brockman Hall for Physics
Rice University
6100 Main St
Houston, Texas, USA

Understanding the magnetic response of the normal state of the cuprates is considered a key piece in solving the puzzle of their high-temperature superconductivity. A simple model for exploring this physics is a two-dimensional Fermi-Hubbard system in an effective Zeeman field. I will report on an experimental study of this model using site-resolved measurements of a spin-imbalanced Fermi gas in an optical lattice. We observe short-range canted antiferromagnetism at half-filling with stronger spin correlations in the direction orthogonal to the magnetization. Away from half-filling the polarization of the gas exhibits non-monotonic behavior with doping for strong interactions, resembling the behavior of the magnetic susceptibility in the cuprates. The realization of lattice Fermi gases with spin-imbalance opens the door to studying exotic superconductivity in large magnetic fields.

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