Emergence of quantum confinement in topological kagome superconductor CsV3Sb5

Cai，Yongqing1,2; Wang，Yuan1; Hao，Zhanyang1; Liu，Yixuan1; Sui，Xuelei3,4; Liang，Zuowei5; Ma，Xiao Ming1; Zhang，Fayuan1; Shen，Zecheng1; Zhang，Chengcheng1; Jiang，Zhicheng6,7; Yang，Yichen6,7; Liu，Wanling6,7; Jiang，Qi6,7; Liu，Zhengtai6,7; Ye，Mao6,7; Shen，Dawei6,7; Gao，Han8; Xiao，Hanbo8; Liu，Zhongkai8; Sun，Zhe9; Liu，Yi9; Cui，Shengtao9; Chen，Jiabin4; Wang，Le1; Liu，Cai1; Lin，Junhao1; Huang，Bing4; Wang，Zhenyu5; Chen，Xianhui5; Mei，Jia Wei1; Wang，Jianfeng4,10; Chen，Chaoyu1,11

2024-12-01

10.1038/s43246-024-00461-z

Communications Materials   影响因子和分区

2662-4443

Quantum confinement is a restriction on the motion of electrons in a material to specific region, resulting in discrete energy levels rather than continuous energy bands. In certain materials, quantum confinement could dramatically reshape the electronic structure and properties of the surface with respect to the bulk. Here, in the recently discovered kagome superconductors CsVSb, we unveil the dominant role of quantum confinement in determining their surface electronic structure. Combining angle-resolved photoemission spectroscopy (ARPES) measurement and density-functional theory simulation, we report the observations of two-dimensional quantum well states due to the confinement of bulk electron pocket and Dirac cone to the nearly isolated surface layer. The theoretical calculations on the slab model also suggest that the ARPES observed spectra are almost entirely contributed by the top two layers. Our results not only explain the disagreement of band structures between the recent experiments and calculations, but also suggest an equally important role played by quantum confinement, together with strong correlation and band topology, in shaping the electronic properties of this material.

ESCI

英语

第一

2-s2.0-85187673280

Scopus

1.Shenzhen Institute for Quantum Science and Engineering (SIQSE) and Department of Physics,Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
2.School of Physics,Dalian University of Technology,Dalian,116024,China
3.College of Mathematics and Physics,Beijing University of Chemical Technology,Beijing,100029,China
4.Beijing Computational Science Research Center,Beijing,100193,China
5.Department of Physics and Chinese Academy of Sciences Key laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei,Anhui,230026,China
6.Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai,201204,China
7.Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai,200050,China
8.School of Physical Science and Technology,ShanghaiTech University,Shanghai,201210,China
9.National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei,Anhui,230029,China
10.School of Physics,Beihang University,Beijing,100191,China
11.Institute of Advanced Science Facilities,Shenzhen,518107,China

Cai，Yongqing,Wang，Yuan,Hao，Zhanyang,et al. Emergence of quantum confinement in topological kagome superconductor CsV3Sb5[J]. Communications Materials,2024,5(1).

Cai，Yongqing.,Wang，Yuan.,Hao，Zhanyang.,Liu，Yixuan.,Sui，Xuelei.,...&Chen，Chaoyu.(2024).Emergence of quantum confinement in topological kagome superconductor CsV3Sb5.Communications Materials,5(1).

Cai，Yongqing,et al."Emergence of quantum confinement in topological kagome superconductor CsV3Sb5".Communications Materials 5.1(2024).