Band and correlated insulators of cold fermions in a mesoscopic lattice
| Autor: | Lebrat, Martin, Grišins, Pjotrs, Husmann, Dominik, Häusler, Samuel, Corman, Laura, Giamarchi, Thierry, Brantut, Jean-Philippe, Esslinger, Tilman |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 8, 011053 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.8.011053 |
| Popis: | 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 non-equilibrium many-body physics. Comment: 8 + 10 pages, 5 + 7 figures |
| Databáze: | arXiv |
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