Strange Metal in Magic-Angle Graphene with near Planckian Dissipation

Physical Review Letters
Yuan CaoPablo Jarillo-Herrero

Abstract

Recent experiments on magic-angle twisted bilayer graphene have discovered correlated insulating behavior and superconductivity at a fractional filling of an isolated narrow band. Here we show that magic-angle bilayer graphene exhibits another hallmark of strongly correlated systems-a broad regime of T-linear resistivity above a small density-dependent crossover temperature-for a range of fillings near the correlated insulator. This behavior is reminiscent of similar behavior in other strongly correlated systems, often denoted "strange metals," such as cuprates, iron pnictides, ruthenates, and cobaltates, where the observations are at odds with expectations in a weakly interacting Fermi liquid. We also extract a transport "scattering rate," which satisfies a near Planckian form that is universally related to the ratio of (k_{B}T/ℏ). Our results establish magic-angle bilayer graphene as a highly tunable platform to investigate strange metal behavior, which could shed light on this mysterious ubiquitous phase of correlated matter.

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Citations

May 23, 2020·Physical Review Letters·J González, T Stauber
Sep 12, 2020·Physical Review Letters·C De BeuleP Recher
Mar 27, 2020·Nature Materials·Philip Ball
Jul 17, 2020·Nature·Harpreet Singh AroraStevan Nadj-Perge
Aug 22, 2020·Science Advances·Rafael M Fernandes, Jörn W F Venderbos
Dec 19, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S S Kubakaddi
Nov 21, 2020·Physical Review Letters·A V LunkinM V Feigel'man
Dec 5, 2020·Physical Review Letters·María Rosendo LópezPablo San-Jose
Nov 20, 2020·Nature Materials·Eva Y Andrei, Allan H MacDonald
Dec 15, 2020·Physical Review Letters·Ying Su, Shi-Zeng Lin
Feb 20, 2021·Physical Review Letters·Tobias M R WolfJose L Lado
Mar 27, 2021·ACS Nano·Feng HeYaguo Wang
Apr 2, 2021·Nature·Jeong Min ParkPablo Jarillo-Herrero
Apr 9, 2021·Nature·Yu SaitoAndrea F Young
Mar 23, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S S Kubakaddi
Jun 18, 2021·Nano-micro Letters·Amol Nimbalkar, Hyunmin Kim
Jul 24, 2021·Physical Review Letters·Aline Ramires, Jose L Lado
Jul 30, 2021·Nature·Gaël GrissonnancheB J Ramshaw
Jul 23, 2021·Nature Communications·D H NguyenS Paschen
Sep 4, 2021·Physical Review Letters·Dominic V Else, T Senthil
Sep 17, 2021·Nature·Augusto GhiottoAbhay N Pasupathy
Oct 2, 2021·Nature Communications·Girish SharmaShaffique Adam
Oct 19, 2021·Nano Letters·Bálint SzentpéteriPéter Makk

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