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- W3207825250 abstract "The emergence of controlled, two-dimensional moiré materials1–6 has uncovered a new platform for investigating topological physics7–9. Twisted double bilayer graphene has been predicted to host a topologically non-trivial gapped phase with Chern number equal to two at charge neutrality, when half the flat bands are filled8,9. However, it can be difficult to diagnose topological states using a single measurement because it is ideal to probe the bulk and edge properties at the same time. Here we report a combination of chemical potential measurements, transport measurements and theoretical calculations that show that twisted double bilayer graphene can host metallic edge transport in addition to simultaneously being insulating in the bulk. A Landauer–Büttiker analysis of the measurements on multi-terminal samples allows us to quantitatively assess the edge-state scattering. We interpret these results as signatures of the predicted topological phase at charge neutrality, but further characterization of the edge transport is required to be certain. Twisted double bilayer graphene is predicted to be a topological insulator under certain conditions. Simultaneous bulk and edge measurements now show metallic transport with a bulk bandgap, suggestive of this prediction." @default.
- W3207825250 created "2021-10-25" @default.
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- W3207825250 date "2021-12-20" @default.
- W3207825250 modified "2023-10-15" @default.
- W3207825250 title "Bulk and edge properties of twisted double bilayer graphene" @default.
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- W3207825250 doi "https://doi.org/10.1038/s41567-021-01419-5" @default.
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