层间电子化物LaCl中原子与阴离子电子的缠合格点
Entwined lattice of atoms and anionic electrons in layered electride LaCl
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中文总结 AI 辅助
该研究发现层间电子化物LaCl中阴离子电子晶格与La原子晶格耦合，将YCl的二分骰子晶格网络转为三分结构，为电子结构设计提供了新的调节手段。
中文摘要 AI 辅助
控制决定电子结构的晶格几何是凝聚态物理的核心课题，但在晶体固体中，该几何通常由原子框架固定。电子化物为电子结构设计提供了替代途径，其过剩电子可组织成阴离子电子晶格（AEL），提供类晶格自由度。近期研究强调了孤立极限，其中YCl中的AEL产生的能带可由骰子晶格模型很好描述。本文利用角分辨光电子能谱（ARPES）表明，与YCl同构的LaCl实现了定性不同的 regime，其中AEL与La阳离子框架缠结，产生完全重构的电子结构。结合ARPES结果与紧束缚模型分析，我们证明这种显著差异源于AEL与La原子晶格间直接跃迁通道的激活。该耦合重塑了有效晶格几何，重构了电子态，并修改了相关的陈带拓扑，将YCl中的二分骰子晶格网络转变为LaCl中的三分结构。我们的发现表明，AEL与原子晶格的耦合可主动塑造决定电子结构的有效晶格几何，该耦合可作为常规材料无法实现的电子结构设计的强大调节旋钮。
英文摘要
Controlling the lattice geometry that governs electronic structure is a central theme in condensed-matter physics, yet in crystalline solids this geometry is usually fixed by the atomic framework. Electrides offer an alternative route to electronic structure design in which their excess electrons can organize into anionic electron lattice (AEL) and provide a lattice-like degree of freedom. Recent work has highlighted the standalone limit, where the AEL in YCl yields bands well described by the dice-lattice model. Here, using angle-resolved photoemission spectroscopy (ARPES), we show that LaCl, although isostructural to YCl, realizes a qualitatively different regime where the AEL is entwined with the La cation framework, producing a fully reconstructed electronic structure. Combining the ARPES result with tight-binding model analysis, we demonstrate that this radical divergence stems from the activation of direct hopping channels between the AEL and the La atomic lattice. This coupling reshapes the effective lattice geometry, reconstructs the electronic states, and modifies the associated Chern band topology, transforming the bipartite dice-lattice network in YCl into a tripartite structure in LaCl. Our findings demonstrate that the coupling between the AEL and the atomic lattice can actively shape the effective lattice geometry that governs the electronic structure. This coupling can act as a powerful tuning knob for electronic structure design that is inaccessible in conventional materials.
