Direct Probing of the Mott Crossover in the SU(N) Fermi-Hubbard Model
By C. Hofrichter, L. Riegger, F. Scazza, M. Hofer, D. R. Fernandes, I. Bloch, S. Folling. 2015
164 citations recorded by the source corpus.
We report on a detailed experimental investigation of the equation of state (EoS) of the three-dimensional Fermi-Hubbard model (FHM) in its generalized SU(N)-symmetric form, using a degenerate ytterbium gas in an optical lattice. In its more common spin-1/2 form, the FHM is a central model of condensed-matter physics. The generalization to N > 2 was first used to describe multi-orbital materials and is expected to exhibit novel many-body phases in a complex phase diagram. By realizing and locally probing the SU(N) FHM with ultracold atoms, we obtain model-free access to thermodynamic quantities. The measurement of the EoS and the local compressibility allows us to characterize the crossover from a compressible metal to an incompressible Mott insulator. We reach specific entropies above Neel order but below that of uncorrelated spins. Having access to the EoS of such a system represents an important step towards probing predicted novel SU(N) phases.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/b2e4a92a8b3b63d568c08b757c32d3738ed1d4d2
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Microscopic Control and Detection of Ultracold Strontium in Optical-Tweezer Arrays (2018, background): “[45] Christian Hofrichter, Luis Riegger, Francesco Scazza, Moritz Höfer, Diogo Rio Fernandes, Immanuel Bloch,”
- Quantum simulation of the Hubbard model with ultracold fermions in optical lattices (2018, unknown): “A similar study has been performed on the Fermi-Hubbard model extended to a particle spin degeneracy higher than 2 [73].”