Moiré-of-moiré Superlattice

By transferring 2D materials on top of each other with twist-angle, the atomic and electronic reconstruction of the resulting moiré superlattice can give rise to novel material properties, including correlated electronic states and superconductivity. On top of twisted bilayer systems, we transfer an additional layer of 2D material with a consecutive twist angle. The two coexisting moiré superlattices give rise to a higher-order moiré-of-moiré superlattice, with a plethora of new length scales and related novel quantum phenomena, including inter-moire Hofstader butterfly, inter-moiré-enhanced Berry curvature, moiré-of-moire correlated electronic states, and signature of superconductivity at extremely low carrier density. 

Stability Diagram of Layer-polarized Quantum Hall States in Twisted Trilayer Graphene

The stability diagram of layer-polarized quantum Hall states in twisted trilayer graphene (tTLG) is measured to quantitatively characterize the interlayer screening and charge distribution in tTLG with the implication of strong inter-atomic-layer Coulomb coupling.

Konstantin Davydov, Daochen Long, Jack Tavakley, Kenji Watanabe, Takashi Taniguchi, Ke Wang, arxiv:2504.09406

Tunable Incommensurability and Spontaneous Symmetry Breaking in the Reconstructed Moiré-of-Moiré Lattices

Using transmission electron microscopy combined with a new interatomic potential simulation, a complete structural phase diagram of twisted trilayer graphene with atomic-scale lattice reconstruction is reported.

Daesung Park, Changwon Park, Eunjung Ko, Kunihiro Yananose, Rebecca Engelke, Xi Zhang, Konstantin Davydov, Matthew Green, Sang Hwa Park, Jae Heon Lee, Kenji Watanabe, Takashi Taniguchi, Sang Mo Yang, Ke Wang, Philip Kim, Young-Woo Son, Hyobin Yoo, arXiv:2402.15760

Tunable inter-moiré Physics in Consecutively Twisted Trilayer Graphene

A new type of inter-moiré Hofstadter butterfly is observed in consecutively twisted trilayer graphene with two distinct twisted angles.

Wei Ren, Konstantin Davydov, Ziyan Zhu, Jaden Ma, Kenji Watanabe, Takashi Taniguchi, Efthimios Kaxiras, Mitchell Luskin, Ke Wang, Physics Review B 110, 115404 (2024) (Editors' Suggestion)

 

Correlated Insulating States and Transport Signature of Superconductivity in Twisted Trilayer Graphene Superlattices

Correlated insulating states and transport signature of superconducting are reported in the moiré-of-moiré superlattice.

Xi Zhang*, Kan-Ting Tsai*, Ziyan Zhu, Wei Ren, Yujie Luo, Stephen Carr, Mitchell Luskin, Efthimios Kaxiras, Ke Wang, Physics Review Letters 127, 166802 (2021) (Editors' Suggestion)