Reentrant topological phases and spin density wave induced by 1D moir\'e potentials

Autor:	Zhang, Guo-Qing, Tang, Ling-Zhi, Quezada, L. F., Dong, Shi-Hai, Zhang, Dan-Wei
Rok vydání:	2025
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	Exotic topological and correlated phases induced by moir\'e potentials have recently been explored in 2D twisted bilayer graphene systems. Here we investigate spin-$1/2$ interacting fermionic atoms in the 1D moir\'e optical superlattice formed by the superposition of two commensurate potentials. We reveal the reentrant topological phases and periodic-moir\'e-spin density wave (PM-SDW) of the ground states in both non-interacting and interacting cases. The reentrant topological phases are driven by the moir\'e potential with the sequent trivial-topological-trivial-topological-trivial transition. The critical exponent of topological transitions and the localization properties of the single-particle eigenstates are studied. The PM-SDW order of the many-body ground state is contributed from the moir\'e potential, and is enhanced by the on-site interaction but suppressed by the nearest-neighbor interaction. Our results enrich the topological physics with multiple transitions and spin-density orders in 1D moir\'e systems, which might be experimentally realized with ultracold atoms in tunable optical lattices. Comment: 11 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2501.01656 Zobrazit plný text záznamu View this record from Arxiv