Bad-metal relaxation dynamics in a Fermi lattice gas

W. Xu, W. R. McGehee, W. N. Morong and B. DeMarco ()
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W. Xu: Massachusetts Institute of Technology
W. R. McGehee: National Institute of Standards and Technology
W. N. Morong: University of Illinois at Urbana-Champaign
B. DeMarco: University of Illinois at Urbana-Champaign

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Electrical current in conventional metals is carried by electrons that retain their individual character. Bad metals, such as the normal state of some high-temperature superconductors, violate this scenario, and the complete picture for their behavior remains unresolved. Here, we report phenomena consistent with bad-metal behaviour in an optical-lattice Hubbard model by measuring the transport lifetime for a mass current excited by stimulated Raman transitions. We demonstrate incompatibility with weak-scattering theory and key characteristics of bad metals: anomalous resistivity scaling consistent with T-linear behavior, the onset of incoherent transport, and the approach to the Mott–Ioffe–Regel limit. Our work demonstrates a direct method for determining the transport lifetime, which is critical to theory but difficult to measure in materials, and exposes minimal ingredients for bad-metal behavior.

Date: 2019
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DOI: 10.1038/s41467-019-09526-x

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