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Correlated states in twisted double bilayer graphene
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Electron-electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle. For bilayer graphene where the two layers are twisted by a "magic angle", flat band and strong many-body effects lead to correlated insulating states and superconductivity. In contrast to monolayer graphene, the band structure of untwisted bilayer graphene can be further tuned by a displacement field, providing an extra degree of freedom to control the flat band that should appear when two bilayers are stacked on top of each other. Here, we report the discovery and characterization of such displacement-field tunable electronic phases in twisted double bilayer graphene. We observe insulating states at a half-filled conduction band in an intermediate range of displacement fields. Furthermore, the resistance gap in the correlated insulator increases with respect to the in-plane magnetic fields and we find that the g factor according to spin Zeeman effect is ~2, indicating spin polarization at half filling. These results establish the twisted double bilayer graphene as an easily tunable platform for exploring quantum many-body states.
Forward citations
Cited by 5 Pith papers
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Attractive electron-electron interactions from internal screening in magic angle twisted bilayer graphene
Using RPA and cRPA, the authors find twist-angle-dependent screening in magic-angle twisted bilayer graphene, including real-space attractive regions in the RPA interaction and strongly reduced Hubbard parameters.
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Giant Orbital Magneto-electric effect and Current-driven Magnetization Switching in Twisted Bilayer Graphene
A small current in strained, hBN-aligned twisted bilayer graphene is predicted to generate a large out-of-plane orbital magnetization and to switch the ferromagnetic state near 3/4 filling.
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Collective Excitations of Quantum Anomalous Hall Ferromagnets in Twisted Bilayer Graphene
A microscopic calculation shows that the quantum anomalous Hall ferromagnet in twisted bilayer graphene is stable against spin and valley magnons, and that valley wave fluctuations limit the ordering temperature.
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Flat Chern Band From Twisted Bilayer MnBi$_2$Te$_4$
A twisted bilayer of MnBi2Te4 is predicted to host an isolated flat Chern band at about one degree twist, offering a time-reversal-broken moire platform for correlated topological states.
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High-$T_\textrm{C}$ Superconductivity Originating from Interlayer Coulomb Coupling in Gate-Charged Twisted Bilayer Graphene Moir$\'{e}$ Superlattices
Using a fitted universal constant from earlier work, the authors calculate twisted-bilayer-graphene transition temperatures of 1.94 K and 3.02 K and claim agreement with mean-field fits to published resistance data.
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