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Band and Correlated Insulators of Cold Fermions in a Mesoscopic Lattice

Published inPhysical Review X, vol. 8, no. 1, 011053
Publication date2018
Abstract

We investigate the transport properties of neutral, fermionic atoms passing through a one-dimensional quantum wire containing a mesoscopic lattice. The lattice is realized by projecting individually controlled, thin optical barriers on top of a ballistic conductor. Building an increasingly longer lattice, one site after another, we observe and characterize the emergence of a band insulating phase, demonstrating control over quantum-coherent transport. We explore the influence of atom-atom interactions and show that the insulating state persists as contact interactions are tuned from moderately to strongly attractive. Using bosonization and classical Monte Carlo simulations, we analyze such a model of interacting fermions and find good qualitative agreement with the data. The robustness of the insulating state supports the existence of a Luther-Emery liquid in the one-dimensional wire. Our work realizes a tunable, site-controlled lattice Fermi gas strongly coupled to reservoirs, which is an ideal test bed for nonequilibrium many-body physics.

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Citation (ISO format)
LEBRAT, Martin et al. Band and Correlated Insulators of Cold Fermions in a Mesoscopic Lattice. In: Physical Review X, 2018, vol. 8, n° 1, p. 011053. doi: 10.1103/PhysRevX.8.011053
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ISSN of the journal2160-3308
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