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Strange metal in magic-angle graphene with near Planckian dissipation
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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. In this paper 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. We also extract a transport "scattering rate", which satisfies a near Planckian form that is universally related to the ratio of $(k_BT/\hbar)$. 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.
Forward citations
Cited by 6 Pith papers
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Attractive electron-electron interactions from internal screening in magic angle twisted bilayer graphene
Using RPA and cRPA, the authors find twist-angle-dependent screening in magic-angle twisted bilayer graphene, including real-space attractive regions in the RPA interaction and strongly reduced Hubbard parameters.
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Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
In bilayer graphene, electron-hole collisions give a universal, temperature-independent conductivity at charge neutrality, and a tunable gap collapses the conductivity onto a single curve.
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Collective Excitations of Quantum Anomalous Hall Ferromagnets in Twisted Bilayer Graphene
A microscopic calculation shows that the quantum anomalous Hall ferromagnet in twisted bilayer graphene is stable against spin and valley magnons, and that valley wave fluctuations limit the ordering temperature.
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On the Planckian bound for heat diffusion in insulators
The thermal transport lifetime in insulators is observed to scale with the ratio of a quantum melting velocity to the sound velocity, explaining the Planckian bound.
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High-$T_\textrm{C}$ Superconductivity Originating from Interlayer Coulomb Coupling in Gate-Charged Twisted Bilayer Graphene Moir$\'{e}$ Superlattices
Using a fitted universal constant from earlier work, the authors calculate twisted-bilayer-graphene transition temperatures of 1.94 K and 3.02 K and claim agreement with mean-field fits to published resistance data.
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Linear in Temperature Resistivity and Associated Mysteries
A review claiming that the dissipative 2D quantum XY model, with one coupling constant, quantitatively explains the strange metal properties and d-wave superconductivity of cuprates and similar quantum critical metals.
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