Quantum simulation: Bad metallic transport in a cold atom fermi-hubbard system

Peter T. Brown, Debayan Mitra, Elmer Guardado-Sanchez, Reza Nourafkan, Alexis Reymbaut, Charles David Hébert, Simon Bergeron, A. M.S. Tremblay, Jure Kokalj, David A. Huse, Peter Schauß, Waseem S. Bakr

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Pages (from-to)379-382
Number of pages4
JournalScience
Volume363
Issue number6425
DOIs
StatePublished - Jan 25 2019

All Science Journal Classification (ASJC) codes

  • General

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    Brown, P. T., Mitra, D., Guardado-Sanchez, E., Nourafkan, R., Reymbaut, A., Hébert, C. D., Bergeron, S., Tremblay, A. M. S., Kokalj, J., Huse, D. A., Schauß, P., & Bakr, W. S. (2019). Quantum simulation: Bad metallic transport in a cold atom fermi-hubbard system. Science, 363(6425), 379-382. https://doi.org/10.1126/science.aat4134