期刊
PHYSICAL REVIEW B
卷 106, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.155115
关键词
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资金
- U.S. DOE, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [W911NF-17-1- 0323]
- ARO
- U.S. DOE, Office of Science, Office of Advanced Scientific Computing Research
- [DE-AC02-05-CH11231]
Motivated by recent experimental observations, this study investigates the electronic ordering instabilities in hole-doped rhombohedral trilayer graphene (RTG). The Fermi surface near Van Hove singularities (VHSs) is resolved using a fermionic hot-spot model, showing possibilities of metallic or superconducting phases. The dominant pairing channel depends on the Fermi surface nesting and Coulomb interaction.
Motivated by recent experimental observations of correlated metallic phases and superconductivity in rhombo-hedral trilayer graphene (RTG), we perform an unbiased study of electronic ordering instabilities in hole-doped RTG. Specifically, we focus on electronic states energetically proximate to Van Hove singularities (VHSs), where a large density of states promotes different interaction-induced symmetry-breaking electronic orders. To resolve the Fermi surface near VHSs, we construct a fermionic hot-spot model and demonstrate that a perpendicular electric field can tune different nesting structures of the Fermi surface. Subsequently, we apply a renormalization group analysis to describe the low-energy phase diagrams of our model under both short-range repulsive interactions as well as realistic (long-range) Coulomb interactions. Our analysis shows instabilities towards either intervalley coherent metallic phases or superconducting phases. The dominant pairing channel depends crucially on the nature of Fermi surface nesting-repulsive Coulomb interaction favors spin-singlet d-wave pairing for relatively small displacement field and spin-singlet i-wave pairing for larger displacement field. We argue that the phase diagram of RTG can be well-understood by modeling the realistic Coulomb interaction as the sum of repulsive density-density interaction and ferromagnetic spin-triplet intervalley coherence (IVC) Hund's coupling, while phonon-mediated electronic interactions have a negligible effect on this system, in sharp contrast to twisted graphene multilayers.
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