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Lifshitz transitions and isospin polarization in twist-decoupled monolayer-bilayer graphene

Alex Boschi1, Leonardo Sabattini2,*, Sergey Slizovskiy3,4, Vaidotas Mišeikis1, Zewdu M. Gebeyehu1, Stiven Forti1, Antonio Rossi1, Kenji Watanabe5, Takashi Taniguchi6 et al.

Fabio Beltram2, Vladimir I. Fal'ko3,4,7, Camilla Coletti1, and Sergio Pezzini2,†

  • *Present address: QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • †Contact author: sergio.pezzini@nano.cnr.it
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Phys. Rev. B 114, L111402 – Published 3 August, 2026

DOI: https://doi.org/10.1103/7d2j-4p3c

Abstract

Bernal-stacked bilayer graphene (BLG) hosts correlated electronic phases tied to low-energy Lifshitz transitions at saddle points in its valence band. To access this regime, ultralow charge disorder and control over a vertical electric field are simultaneously required. Here, we employ a twist-decoupled monolayer (MLG) to bias a proximal BLG in the absence of an external displacement field (D). We thereby reveal threefold degenerate quantum Hall states at D=0, with multiple transitions driven by doping, magnetic and electric field. Spontaneous broken symmetry in the vicinity of the valence band edge is signaled by the emergence of quantum oscillations with anomalous frequencies and large quasiparticle mass. These results indicate that electronic interactions in BLG are preserved in presence of an atomically close MLG, while showcasing the potential of CVD-grown graphene multilayers for the exploration of correlated phases of matter.

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Phys. Rev. B 114, L111402– Published 3 August, 2026
  • Received 20 April 2026
  • Revised 16 June 2026
  • Accepted 8 July 2026
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