Assembling a mesoscopic lattice in a quantum wire for ultracold fermions

Author
Lebrat, Martin · Grišins, Pjotrs · Husmann, Dominik · Häusler, Samuel · Corman, Laura · Giamarchi, Thierry · Brantut, Jean-Philippe · Esslinger, Tilman
Year 2017
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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 weakly 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.

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Details

Title
Assembling a mesoscopic lattice in a quantum wire for ultracold fermions
Author
Lebrat, Martin · Grišins, Pjotrs · Husmann, Dominik · Häusler, Samuel · Corman, Laura · Giamarchi, Thierry · Brantut, Jean-Philippe · Esslinger, Tilman
Year
2017
Type
Research Article
Language
eng
Comment
7 + 9 pages, 5 + 6 figures
History
2017-08-03 00:00:00
Categories
Condensed Matter · Mesoscopic Systems and Quantum Hall Effect
This is Version 1 of this record. We added this version on August 5, 2017. This version is based on an original data import from arXiv.org e-Print archive.