Heavy quasiparticles and cascades without symmetry breaking in twisted bilayer graphene

Anushree Datta, M. J. Calderón, A. Camjayi and E. Bascones ()
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Anushree Datta: Instituto de Ciencia de Materiales de Madrid (ICMM). Consejo Superior de Investigaciones Científicas (CSIC)
M. J. Calderón: Instituto de Ciencia de Materiales de Madrid (ICMM). Consejo Superior de Investigaciones Científicas (CSIC)
A. Camjayi: Universidad de Buenos Aires, Ciclo Básico Común
E. Bascones: Instituto de Ciencia de Materiales de Madrid (ICMM). Consejo Superior de Investigaciones Científicas (CSIC)

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Among the variety of correlated states exhibited by twisted bilayer graphene, cascades in the spectroscopic properties and in the electronic compressibility occur over larger ranges of energy, twist angle and temperature compared to other effects. This suggests a hierarchy of phenomena. Using a combined dynamical mean-field theory and Hartree calculation, we show that the spectral weight reorganisation associated with the formation of local moments and heavy quasiparticles can explain the cascade of electronic resets without invoking symmetry breaking orders. The phenomena reproduced here include the cascade flow of spectral weight, the oscillations of remote band energies, and the asymmetric jumps of the inverse compressibility. We also predict a strong momentum differentiation in the incoherent spectral weight associated with the fragile topology of twisted bilayer graphene.

Date: 2023
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DOI: 10.1038/s41467-023-40754-4

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