半满莫尔哈伯德模型中的手征自旋液体与手征反铁磁性：在扭转双层过渡金属二硫化物中的潜在应用
Chiral spin liquid and chiral antiferromagnetism in half-filled moiré Hubbard model: possible applications to twisted bilayer TMDs
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中文总结 AI 辅助
本文通过大规模密度矩阵重整化群模拟，研究半满三角晶格莫尔哈伯德模型，发现位移场可丰富三角哈伯德相图，揭示手征自旋液体与手征反铁磁相的连续相变，为扭转双层过渡金属二硫化物实验提供指导。
中文摘要 AI 辅助
扭转过渡金属二硫化物（twisted transition metal dichalcogenides）为研究超越常规凝聚态系统的关联物理提供了极具可调性的莫尔平台，其中位移场与扭转角之间的有趣相互作用仍有待完全阐明。本文中，我们采用大规模密度矩阵重整化群（density matrix renormalization group）模拟，研究半满三角晶格上的最小莫尔哈伯德模型，其中位移场效应由自旋相关的交错通量捕获。我们发现位移场在多个定性层面显著丰富了三角哈伯德相图：它在狭窄的弱场范围外迅速破坏手征自旋液体相，在强耦合120°反铁磁相中诱导显著的手征关联，并在较弱耦合下稳定非共线自旋密度波相；我们还发现，在有限位移场下，手征自旋液体与手征反铁磁相之间存在连续相变的迹象，该相变可能由 spinon（自旋子）凝聚驱动。我们的研究揭示了由位移场驱动的丰富多体物理，并为莫尔超晶格系统的未来实验提供了有用指导。
英文摘要
Twisted transition metal dichalcogenides offer an exceptionally tunable moiré platform for studying correlation physics beyond conventional condensed matter systems. In particular, the intriguing interplay between the displacement field and the twist angle remains to be fully resolved. In this paper, we use large-scale density matrix renormalization group simulations to study the minimal moiré Hubbard model on a triangular lattice at half-filling, where the displacement field effect is captured by a spin-dependent staggered flux. We find that the displacement field significantly enriches the triangular Hubbard phase diagram in several qualitative ways. It rapidly destabilizes the chiral spin liquid phase beyond a narrow weak-field regime, induces pronounced chiral correlations in the strong-coupling $120^\circ$-antiferromagnetic phase, and stabilizes incommensurate spin-density wave phases at weaker coupling. We further find signatures of a continuous transition between the chiral spin liquid and chiral antiferromagnetic phases at a finite displacement field, potentially driven by spinon condensation. Our results uncover rich displacement-field-driven many-body physics and provide useful guidance for future experiments in moiré superlattice systems.
