Quantum cascade of correlated phases in trigonally warped bilayer graphene

Anna M. Seiler, Fabian R. Geisenhof, Felix Winterer, Kenji Watanabe, Takashi Taniguchi, Tianyi Xu, Fan Zhang () and R. Thomas Weitz ()
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Anna M. Seiler: University of Göttingen
Fabian R. Geisenhof: Physics of Nanosystems, Department of Physics, Ludwig-Maximilians-Universität München
Felix Winterer: Physics of Nanosystems, Department of Physics, Ludwig-Maximilians-Universität München
Kenji Watanabe: Research Center for Functional Materials, National Institute for Materials Science
Takashi Taniguchi: International Center for Materials Nanoarchitectonics, National Institute for Materials Science
Tianyi Xu: University of Texas at Dallas
Fan Zhang: University of Texas at Dallas
R. Thomas Weitz: University of Göttingen

Nature, 2022, vol. 608, issue 7922, 298-302

Abstract: Abstract Divergent density of states offers an opportunity to explore a wide variety of correlated electron physics. In the thinnest limit, this has been predicted and verified in the ultraflat bands of magic-angle twisted bilayer graphene1–5, the band touching points of few-layer rhombohedral graphite6–8 and the lightly doped rhombohedral trilayer graphene9–11. The simpler and seemingly better understood Bernal bilayer graphene is also susceptible to orbital magnetism at charge neutrality7 leading to layer antiferromagnetic states12 or quantum anomalous Hall states13. Here we report the observation of a cascade of correlated phases in the vicinity of electric-field-controlled Lifshitz transitions14,15 and van Hove singularities16 in Bernal bilayer graphene. We provide evidence for the observation of Stoner ferromagnets in the form of half and quarter metals10,11. Furthermore, we identify signatures consistent with a topologically non-trivial Wigner–Hall crystal17 at zero magnetic field and its transition to a trivial Wigner crystal, as well as two correlated metals whose behaviour deviates from that of standard Fermi liquids. Our results in this reproducible, tunable, simple system open up new horizons for studying strongly correlated electrons.

Date: 2022
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DOI: 10.1038/s41586-022-04937-1

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