期刊
NATURE PHYSICS
卷 18, 期 1, 页码 48-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41567-021-01419-5
关键词
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资金
- National Science Foundation (NSF) [MRSEC DMR-1720595, EECS-1610008, EECS-2122476]
- Army Research Office [W911NF-17-1-0312]
- Welch Foundation [F1473, F-2018-20190330]
- NSF [NNCI-2025227]
- DOE [DE-SC0016239]
- Schmidt Fund for Innovative Research
- Packard Foundation
- Gordon and Betty Moore Foundation [GBMF8685]
- Guggenheim Fellowship from the John Simon Guggenheim Memorial Foundation
- NSF-EAGER [DMR 1643312]
- NSFMRSEC [DMR-1420541, DMR-2011750]
- ONR [N00014-20-1-2303]
- BSF Israel US foundation [2018226]
- Princeton Global Network Funds
- Marshall Scholarship - Marshall Aid Commemoration Commission
- Elemental Strategy Initiative by MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP19H05790, JP20H00354]
- Simons Investigator grant [404513]
The discovery that twisted double bilayer graphene can exhibit both metallic edge transport and insulating bulk properties may be a signature of the predicted topological phase. Further characterization of the edge transport is necessary to confirm this finding.
The emergence of controlled, two-dimensional moire materials(1-6 )has uncovered a new platform for investigating topological physics(7-9). 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 filled(8,9). 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-Buttiker 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.
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