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Tunable Lifshitz Transitions and Multiband Transport in Tetralayer Graphene
Yanmeng Shi1, Shi Che1,2, Kuan Zhou1
1Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, USA.
Abstract:
As the Fermi level and band structure of two-dimensional materials are readily tunable, they constitute an ideal platform for exploring the Lifshitz transition, a change in the topology of a material's Fermi surface. Using tetralayer graphene that host two intersecting massive Dirac bands, we demonstrate multiple Lifshitz transitions and multiband transport, which manifest as a nonmonotonic dependence of conductivity on the charge density n and out-of-plane electric field D, anomalous quantum Hall sequences and Landau level crossings that evolve with n, D, and B.
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