Cascades between Light and Heavy Fermions in the Normal State of Magic-Angle Twisted Bilayer Graphene

Kang, Jian; Bernevig, B. Andrei; Vafek, Oskar

doi:10.1103/physrevlett.127.266402

Title: Cascades between Light and Heavy Fermions in the Normal State of Magic-Angle Twisted Bilayer Graphene

Journal Article · 23 December 2021 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.127.266402 · OSTI ID:1980242

Kang, Jian ^[1]; Bernevig, B. Andrei ^[2];

^[3]

Soochow Univ., Suzhou (China). Inst. for Advanced Study; OSTI
Princeton Univ., NJ (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida State Univ., Tallahassee, FL (United States)

We present a framework for understanding the cascade transitions and the Landau level degeneracies of twisted bilayer graphene. The Coulomb interaction projected onto narrow bands causes the charged excitations at an integer filling to disperse, forming new bands. If the excitation moves the filling away from the charge neutrality point, then it has a band minimum at the moiré Brillouin zone center with a small mass that compares well with the experiment; if towards the charge neutrality point, then it has a much larger mass and a higher degeneracy. At a nonzero density away from an integer filling the excitations interact. The system on the small mass side has a large bandwidth and forms a Fermi liquid. On the large mass side the bandwidth is narrow, the compressibility is negative and the Fermi liquid is likely unstable. This explains the observed sawtooth features in compressibility, the Landau fans pointing away from charge neutrality and their degeneracies. The framework sets the stage for superconductivity at lower temperatures.

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF)

Grant/Contract Number:: SC0016239

OSTI ID:: 1980242

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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