2 × 2 Charge Density Wave in Fe0.33NbSe2 Stabilized by Disordered Intercalation

作者：Hui Tian, Tongrui Li, Yunmei Zhang, Yuliang Li, Ziyue Shen, Yunbo Wu, Zheng Wei, Yafei Chu, Weican Lan, Xin Zheng, Zhengming Shang, Zongyi Wang, Peng Wu, Guanyin Gao, Min Ge, Yanru Wang, Mengzhu Shi, Zhengtai Liu, Zhengtai Liu, Lidong Zhang, Dawei Shen, Yi Liu, Zhenyu Wang, Zhanfeng Liu, Zhanfeng Liu, Shengtao Cui, Li Song, Zhe Sun · 发表于：ACS Nano · 年份：2025 · DOI：10.1021/acsnano.5c04688 · 被引用次数：2 · 研究领域：2D Materials and Applications、Iron-based superconductors research、Molecular Junctions and Nanostructures

The complex interplay between electronic and lattice degrees of freedom underlies a rich variety of emergent phenomena in quantum materials, particularly charge density waves (CDWs). Understanding the distinct roles of electron carriers and structural order in CDW formation is crucial for elucidating the underlying mechanisms and enabling control over material properties. The intertwined effects of charge doping and structural periodicity make it challenging to isolate the individual contributions to lattice modulations. Here, we observe a 2 × 2 CDW in Fe 0.33 NbSe 2 stabilized by disordered Fe intercalation. This observation suggests that charge transfer from the disordered Fe intercalation layer plays a key role in stabilizing the 2 × 2 modulation within the NbSe 2 layers. The observation of band and Fermi surface folding provides clear evidence of electronic structure reconstruction induced by the 2 × 2 CDW transition. We note that as the temperature increases, the spectral weight ratio between the folded band and the primary band gradually decreases, a trend consistent with the characteristics of a CDW. Our results demonstrate disorder-induced charge doping as a powerful tool for tailoring electronic properties in two-dimensional materials.