Bad metallic transport in a cold atom Fermi-Hubbard system

TitreBad metallic transport in a cold atom Fermi-Hubbard system
Type de publicationJournal Article
Nouvelles publications2018
AuteursBrown, PT, Mitra, D, Guardado-Sanchez, E, Nourafkan, R, Reymbaut, A, Hébert, C-D, Bergeron, S, Tremblay, A-MS, Kokalj, J, Huse, DA, Schauß, P, Bakr, WS
JournalScience
ISBN0036-8075
Résumé

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 6Li in a two-dimensional (2D) 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 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 develop here may be applied to measurements of other transport quantities, including the optical conductivity and thermopower.

URLhttp://science.sciencemag.org/content/early/2018/12/06/science.aat4134
DOI10.1126/science.aat4134
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