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Koepsell, Joannis; Bourgund, Dominik; Sompet, Pimonpan; Hirthe, Sarah; Bohrdt, Annabelle; Wang, Yao; Grusdt, Fabian; Demler, Eugene; Salomon, Guillaume; Gross, Christian and Bloch, Immanuel (2021): Microscopic evolution of doped Mott insulators from polaronic metal to Fermi liquid. In: Science, Vol. 374, No. 6563: pp. 82-86

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The competition between antiferromagnetism and hole motion in two-dimensional Mott insulators lies at the heart of a doping-dependent transition from an anomalous metal to a conventional Fermi liquid. We observe such a crossover in Fermi-Hubbard systems on a cold-atom quantum simulator and reveal the transformation of multipoint correlations between spins and holes upon increasing doping at temperatures around the superexchange energy. Conventional observables, such as spin susceptibility, are furthermore computed from the microscopic snapshots of the system. Starting from a magnetic polaron regime, we find the system evolves into a Fermi liquid featuring incommensurate magnetic fluctuations and fundamentally altered correlations. The crossover is completed for hole dopings around 30%. Our work benchmarks theoretical approaches and discusses possible connections to lowertemperature phenomena.

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