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Spin-imbalance in a 2D Fermi-Hubbard system.

Peter T Brown1, Debayan Mitra1, Elmer Guardado-Sanchez1

  • 1Department of Physics, Princeton University, Princeton, NJ 08544, USA.

Science (New York, N.Y.)
|October 1, 2017
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Summary
This summary is machine-generated.

Researchers studied the Fermi-Hubbard model with magnetic fields and doping. They observed anisotropic antiferromagnetic correlations and nonmonotonic polarization, revealing insights into quantum magnetism and superconductivity in strongly correlated systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Systems

Background:

  • Strong interactions and magnetic fields drive novel quantum phenomena.
  • The two-dimensional Fermi-Hubbard model is key to understanding strongly correlated fermions.

Purpose of the Study:

  • To experimentally investigate the Fermi-Hubbard model under Zeeman fields and varying doping.
  • To reveal the emergence of magnetic correlations and polarization.
  • To map the low-temperature phase diagram.

Main Methods:

  • Site-resolved measurements on the two-dimensional Fermi-Hubbard model.
  • Application of a Zeeman field and controlled doping.
  • Analysis of magnetic correlations and local polarization.

Main Results:

  • Observed anisotropic antiferromagnetic correlations, indicating a precursor to canted order.
  • Detected nonmonotonic local polarization behavior with doping in strongly interacting regimes.
  • Identified a transition from antiferromagnetic insulator to metallic phase.

Conclusions:

  • Experimental insights into the complex phase diagram of the Fermi-Hubbard model.
  • Understanding the interplay of interactions, magnetic fields, and doping in quantum systems.
  • Foundation for further exploration of exotic superconductivity and magnetism.