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Title: Bad Metallic Transport in a Modified Hubbard Model

Abstract

Strongly correlated metals often display anomalous transport, including T-linear resistivity above the Mott-Ioffe-Regel limit. We introduce a tractable microscopic model for bad metals, by restoring in the well-known Hubbard model—with hopping t and on-site repulsion U—a “screened Coulomb” interaction between charge densities that decays exponentially with spatial separation. This interaction lifts the extensive degeneracy in the spectrum of the t = 0 Hubbard model, allowing us to fully characterize the small t electric, thermal, and thermoelectric transport in our strongly correlated model. Throughout the phase diagram we observe T-linear resistivity above the Mott-Ioffe-Regel limit, together with strong violation of the Wiedemann-Franz law and a large thermopower that can undergo sign change.

Authors:
 [1];  [1];  [1]
  1. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1526408
Alternate Identifier(s):
OSTI ID: 1511878
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 18; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Mousatov, Connie H., Esterlis, Ilya, and Hartnoll, Sean A. Bad Metallic Transport in a Modified Hubbard Model. United States: N. p., 2019. Web. doi:10.1103/physrevlett.122.186601.
Mousatov, Connie H., Esterlis, Ilya, & Hartnoll, Sean A. Bad Metallic Transport in a Modified Hubbard Model. United States. doi:10.1103/physrevlett.122.186601.
Mousatov, Connie H., Esterlis, Ilya, and Hartnoll, Sean A. Fri . "Bad Metallic Transport in a Modified Hubbard Model". United States. doi:10.1103/physrevlett.122.186601.
@article{osti_1526408,
title = {Bad Metallic Transport in a Modified Hubbard Model},
author = {Mousatov, Connie H. and Esterlis, Ilya and Hartnoll, Sean A.},
abstractNote = {Strongly correlated metals often display anomalous transport, including T-linear resistivity above the Mott-Ioffe-Regel limit. We introduce a tractable microscopic model for bad metals, by restoring in the well-known Hubbard model—with hopping t and on-site repulsion U—a “screened Coulomb” interaction between charge densities that decays exponentially with spatial separation. This interaction lifts the extensive degeneracy in the spectrum of the t = 0 Hubbard model, allowing us to fully characterize the small t electric, thermal, and thermoelectric transport in our strongly correlated model. Throughout the phase diagram we observe T-linear resistivity above the Mott-Ioffe-Regel limit, together with strong violation of the Wiedemann-Franz law and a large thermopower that can undergo sign change.},
doi = {10.1103/physrevlett.122.186601},
journal = {Physical Review Letters},
number = 18,
volume = 122,
place = {United States},
year = {2019},
month = {5}
}

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