Metallic and Insulating Phases of Repulsively Interacting Fermions in a 3D Optical Lattice - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: The fermionic Hubbard model plays a fundamental role in the description ofstrongly correlated materials. Here we report on the realization of thisHamiltonian using a repulsively interacting spin mixture of ultracold $^{40}$Katoms in a 3D optical lattice. We have implemented a new method to directlymeasure the compressibility of the quantum gas in the trap using in-situimaging and independent control of external confinement and lattice depth.Together with a comparison to ab-initio Dynamical Mean Field Theorycalculations, we show how the system evolves for increasing confinement from acompressible dilute metal over a strongly-interacting Fermi liquid into a bandinsulating state. For strong interactions, we find evidence for an emergentincompressible Mott insulating phase.



Author: U. Schneider, L. Hackermuller, S. Will, Th. Best, I. Bloch, T. A. Costi, R. W. Helmes, D. Rasch, A. Rosch

Source: https://arxiv.org/







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