Abstract
Layers of two-dimensional materials stacked with a small twist angle give rise to beating periodic patterns on a scale much larger than the original lattice, referred to as a “moiré superlattice.” Here, we demonstrate a higher-order “moiré of moiré” superlattice in twisted trilayer graphene with two consecutive small twist angles. We report correlated insulating states near the half filling of the moiré of moiré superlattice at an extremely low carrier density (), near which we also report a zero-resistance transport behavior typically expected in a 2D superconductor. The full-occupancy ( and ) states are semimetallic and gapless, distinct from the twisted bilayer systems.
| Original language | English (US) |
|---|---|
| Article number | 166802 |
| Journal | Physical review letters |
| Volume | 127 |
| Issue number | 16 |
| DOIs | |
| State | Published - Oct 15 2021 |
Bibliographical note
Funding Information:We thank Philip Kim, Allen Goldman, Paul Crowell, and Hyobin Yoo for helpful experimental discussions and Andrey Chubukov, Rafael Fernandes, and Boris Shklovski for helpful theoretical discussion. Electrical transport study is supported by ARO MURI Grant No. W911NF-14-1-0247. Structural study is supported by NSF DMREF Grant No. 1922165. Z. Z. and S. C. are supported by the STC Center for Integrated Quantum Materials, NSF Grant No. DMR-1231319. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nanotechnology Coordinated Infrastructure (NNCI) under Award No. ECCS-2025124.
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© 2021 American Physical Society.