Site-Resolved Measurement of the Spin-Correlation Function in the Fermi-Hubbard Model
Fig. 1A. Experimental technique for measuring spin correlations.*
[Reprinted with permission from AAAS ©2016]
Exotic phases of matter can emerge from strong correlations in quantum many-body systems. Quantum gas microscopy affords the opportunity to study these correlations with unprecedented detail. In the latest issue of Science, Prof Markus Greiner and members of his group report site-resolved observations of antiferromagnetic correlations in a two-dimensional, Hubbard-regime optical lattice and demonstrate the ability to measure the spin-correlation function over any distance. They measure the in situ distributions of the particle density and magnetic correlations, extract thermodynamic quantities from comparisons to theory, and observe statistically significant correlations over three lattice sites. The temperatures that they reach approach the limits of available numerical simulations. The physicists believe the direct access to many-body physics at the single-particle level demonstrated by their results will further our understanding of how the interplay of motion and magnetism gives rise to new states of matter.*See Maxwell F. Parsons, Anton Mazurenko, Christie S. Chiu, Geoffrey Ji, Daniel Greif, and Markus Greiner, "Site-resolved measurement of the spin-correlation function in the Fermi-Hubbard model," Science 353: 6305 (16 Sep 2016) DOI: 10.1126/science.aag1430.