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Bad-metal relaxation dynamics in a Fermi lattice gas

Author

Listed:
  • 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)

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.

Suggested Citation

  • W. Xu & W. R. McGehee & W. N. Morong & B. DeMarco, 2019. "Bad-metal relaxation dynamics in a Fermi lattice gas," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09526-x
    DOI: 10.1038/s41467-019-09526-x
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    Cited by:

    1. Max Heyl & Kyosuke Adachi & Yuki M. Itahashi & Yuji Nakagawa & Yuichi Kasahara & Emil J. W. List-Kratochvil & Yusuke Kato & Yoshihiro Iwasa, 2022. "Vortex dynamics in the two-dimensional BCS-BEC crossover," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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