标题： 具有呼吸 Kagome 晶格的晶体中内在莫特态及其层奇偶振荡的直接证据直至单层 显示英文标题

标题： Direct evidence of intrinsic Mott state and its layer-parity oscillation in a breathing kagome crystal down to monolayer

摘要： 我们报告了通过结合扫描隧道显微镜（STM）和动力学平均场理论，在层状铌$_3$氯$_8$中直接光谱证据的关联驱动Mott态。Hubbard带持续到单层，为铌$_3$氯$_8$中的Mott性提供了决定性的证据。尽管Mott能隙的大小在所有层中几乎保持不变，但在局域态密度（LDOS）中出现了显著的层奇偶依赖振荡，存在于偶数层（n=2,4,6）和奇数层（n=1,3,5）之间，这分别来源于受阻原子态的二聚化和关联调制。我们的结论得到了高度绝缘系统原子尺度LDOS映射关键技术进步的支持。这项工作为铌三氯化物八中的关联驱动Mott基态提供了决定性的实验验证，同时确立了一种通用协议，用于使用低温STM技术研究层状绝缘体中电子关联与层间耦合的相互作用。 显示英文摘要

摘要： We report direct spectroscopic evidence of correlation-driven Mott states in layered Nb$_3$Cl$_8$ through combining scanning tunneling microscopy (STM) and dynamical mean-field theory. The Hubbard bands persist down to monolayer, providing the definitive evidence for the Mottness in Nb$_3$Cl$_8$. While the size of the Mott gap remains almost constant across all layers, a striking layer-parity-dependent oscillation emerges in the local density of states (LDOS) between even (n = 2,4,6) and odd layers (n = 1,3,5), which arises from the dimerization and correlation modulation of the obstructed atomic states, respectively. Our conclusions are supported by a critical technical advance in atomic-scale LDOS mapping for highly insulating systems. This work provides the definitive experimental verification of correlation-driven Mott ground states in Nb3Cl8 while establishing a general protocol for investigating the interplay of electronic correlation and interlayer coupling in layered insulators by using low-temperature STM technique.