Cr基Kagome超导体中的自旋激发与平坦电子带
强关联电子
2025-11-25 v3
摘要
在探索拓扑和关联驱动的量子态过程中，Kagome晶格材料因其能带结构而备受关注，该结构包含由电子波函数量子相消干涉产生的平坦带。将平坦带调谐至化学势可诱导电子不稳定性和涌现序。尽管已有大量研究，但块体材料中平坦带调谐至化学势及其在涌现序中作用的直接证据仍然缺乏。利用角分辨光电子能谱、共振非弹性X射线散射和密度泛函理论，我们展示了Cr基Kagome金属超导体{\Cr}的低能结构由费米能级处的平坦带主导。我们还观察到低温转变过程中演化的低能磁激发，与平坦带位移基本一致。我们的结果表明低温序具有磁性起源，且Kagome平坦带可能在该序的涌现中发挥作用。
引用
@article{arxiv.2406.05293,
title = {Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor},
author = {Zehao Wang and Yucheng Guo and Hsiao Yu Huang and Fang Xie and Yuefei Huang and Bin Gao and Ji Seop Oh and Han Wu and Jun Okamoto and Ganesha Channagowdra and Chien Te Chen and Feng Ye and Xingye Lu and Zhaoyu Liu and Zheng Ren and Yuan Fang and Yiming Wang and Ananya Biswas and Yichen Zhang and Ziqin Yue and Cheng Hu and Chris Jozwiak and Aaron Bostwick and Eli Rotenberg and Makoto Hashimoto and Donghui Lu and Junichiro Kono and Jiun Haw Chu and Boris I Yakobson and Robert J Birgeneau and Guang Han Cao and Atsushi Fujimori and Di Jing Huang and Qimiao Si and Ming Yi and Pengcheng Dai},
journal= {arXiv preprint arXiv:2406.05293},
year = {2025}
}
备注
Published in Nature Communications 16, 7573 (2025). 11 pages, 4 main figures, 13 supplementary figures