Feynman diagrams versus Fermi-gas Feynman emulator
Author(s)Sommer, Ariel Tjodolv; Cheuk, Lawrence W.; Zwierlein, Martin Wolfram; Houcke, K. Van; Werner, F.; Kozik, E.; Prokofev, N.; Svistunov, B.; Schirotzek, A.; Ku, Mark J. H.; ... Show more Show less
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Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is usually plagued by the intricate quantum statistics at play. Here we present a cross-validation between a new theoretical approach, bold diagrammatic Monte Carlo and precision experiments on ultracold atoms. Specifically, we compute and measure, with unprecedented precision, the normal-state equation of state of the unitary gas, a prototypical example of a strongly correlated fermionic system. Excellent agreement demonstrates that a series of Feynman diagrams can be controllably resummed in a non-perturbative regime using bold diagrammatic Monte Carlo.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics; MIT-Harvard Center for Ultracold Atoms
Nature Publishing Group
Van Houcke, K. et al. “Feynman Diagrams Versus Fermi-gas Feynman Emulator.” Nature Physics 8.5 (2012): 366–370.
Author's final manuscript