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Bad metallic transport in a cold atom Fermi-Hubbard system

Author(s): Brown, Peter T; Mitra, Debayan; Guardado-Sanchez, Elmer; Nourafkan, Reza; Reymbaut, Alexis; et al

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Abstract: Strong interactions in many-body quantum systems complicate the interpretation of charge transport in such materials. To shed light on this problem, we study transport in a clean quantum system: ultracold lithium-6 in a two-dimensional optical lattice, a testing ground for strong interaction physics in the Fermi-Hubbard model. We determine the diffusion constant by measuring the relaxation of an imposed density modulation and modeling its decay hydrodynamically. The diffusion constant is converted to a resistivity by using the Nernst-Einstein relation. That resistivity exhibits a linear temperature dependence and shows no evidence of saturation, two characteristic signatures of a bad metal. The techniques we developed in this study may be applied to measurements of other transport quantities, including the optical conductivity and thermopower.
Publication Date: 25-Jan-2019
Citation: Brown, Peter T, Mitra, Debayan, Guardado-Sanchez, Elmer, Nourafkan, Reza, Reymbaut, Alexis, Hebert, Charles-David, Bergeron, Simon, Tremblay, A-MS, Kokalj, Jure, Huse, David A, Schauss, Peter, Bakr, Waseem S. (2019). Bad metallic transport in a cold atom Fermi-Hubbard system. SCIENCE, 363 (379 - 382. doi:10.1126/science.aat4134
DOI: doi:10.1126/science.aat4134
ISSN: 0036-8075
EISSN: 1095-9203
Pages: 379 - 382
Type of Material: Journal Article
Journal/Proceeding Title: SCIENCE
Version: Author's manuscript

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