Abstract
The subtle interplay between kinetic energy, interactions, and dimensionality challenges our comprehension of strongly correlated physics observed, for example, in the solid state. In this quest, the Hubbard model has emerged as a conceptually simple, yet rich model describing such physics. Here we present an experimental determination of the equation of state of the repulsive two-dimensional Hubbard model over a broad range of interactions and temperatures, down to using high-resolution imaging of ultracold fermionic atoms in optical lattices. We show density profiles, compressibilities, and double occupancies over the whole doping range, and, hence, our results constitute benchmarks for state-of-the-art theoretical approaches.
- Received 2 February 2016
DOI:https://doi.org/10.1103/PhysRevLett.116.175301
© 2016 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
A Close Look at the Fermi-Hubbard Model
Published 25 April 2016
The engineered simplicity of a cold-atom system described by the 2D Fermi-Hubbard model allows for a precision test of the model’s equation of state.
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