Donostia International Physics Center, Spain

摘要：

The study of twisted materials has opened new opportunities for investigating topological phases and strongly correlated physics. Beyond well-known cases such as twisted bilayer graphene (TBG) and twisted transition metal dichalcogenides (TMDs), many other twistable 2D materials remain largely unexplored. In this talk, I will introduce our recent works on exploring new moire systems.

Based on the Topological 2D Materials Database (2D-TQCDB), we develop a high-throughput algorithm to search for theoretically twistable — single- or multilayer systems whose moire structures can be described by simple continuum models. I will highlight representative candidates, show their twisted-bilayer band structures, and introduce corresponding simplified continuum models.

In particular, we introduce a new class of moiré systems based on triangular lattices with low-energy states at the M points of the Brillouin zone. By performing large-scale ab-initio simulations on twisted 1T-SnSe₂ and 1T-ZrS₂, we develop quantitative continuum models and show that the corresponding M-point moire Hamiltonians exhibit emergent momentum-space nonsymmorphic symmetries and a kagome plane-wave lattice in momentum space. Furthermore, the non-symmorphic momentum-space in-plane mirror symmetry makes some of the M-point moiré Hamiltonians quasi-one-dimensional in each valley, suggesting the possibility of realizing Luttinger liquid physics.

参考文献：

[1] Jiang Yi, et al. "2D Theoretically Twistable Material Database." arXiv:2411.09741 (2024).

[2] Călugăru Dumitru*, Jiang Yi*, Hu Haoyu*, Pi Hanqi*, et al. "A New Moire Platform Based on M-Point Twisting." arXiv preprint arXiv:2411.18684 (2024)

邀请人：方辰

联系电话：82649329

地点：中国科学院物理研究所M830