Slope invariant T-linear resistivity from local self-energy

Peter Cha, Aavishkar A. Patel, Emanuel Gull, Eun Ah Kim

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A theoretical understanding of the enigmatic linear-in-temperature (T) resistivity, ubiquitous in strongly correlated metallic systems, has been a long sought-after goal. Furthermore, the slope of this robust T-linear resistivity is also observed to stay constant through crossovers between different temperature regimes: A phenomenon we dub "slope invariance."Recently, several solvable models with T-linear resistivity have been proposed, putting us in an opportune moment to compare their inner workings in various explicit calculations. We consider two strongly correlated models with local self-energies that demonstrate T linearity: A lattice of coupled Sachdev-Ye-Kitaev models and the Hubbard model in single-site dynamical mean-field theory. We find that the two models achieve T linearity through distinct mechanisms at intermediate temperatures. However, we also find that these mechanisms converge to an identical form at high temperatures. Surprisingly, both models exhibit "slope invariance"across the two temperature regimes. Thus not only do we reveal some of the diversity in the theoretical inner workings that can lead to T-linear resistivity, but we also establish that different mechanisms can result in "slope invarance."

Original languageEnglish
Article number033434
JournalPhysical Review Research
Volume2
Issue number3
DOIs
StatePublished - Sep 2020

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