A non-rigid shift of band dispersions induced by Cu intercalation in 2H-TaSe2  

作　　者：Pengdong Wang Rashid Khan Zhanfeng Liu Bo Zhang Yuliang Li Sheng Wang Yunbo Wu Hongen Zhu Yi Liu Guobin Zhang Dayong Liu Shuangming Chen Li Song Zhe Sun 

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China [2]Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,P.0.Box 1129,Hefei 230031,China [3]Key Laboratory of Strongly-coupled Quantum Matter Physics,Chinese Academy of Sciences,University of Science and Technology of China,Hefei 230026,China [4]CAS Centerfor Excellence in Superconducting Electronics(CENSE),Shanghai 200050,China

出　　处：《Nano Research》2020年第2期353-357,共5页纳米研究（英文版）

基　　金：We acknowledge the financial support from the National Key R&D Program of China(No.2017YFA0402901,2016YFA0401004);National Natural Science Foundation of China(No.11674296,21727801 and 11621063);the Key Research Program of the Chinese Academy of Sciences(No.XDPB01);the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology(No.2018CXFX002),NSFC-MAECI(51861135202).

摘　　要：The intercalation of metal is a promising method for the modulating electronic properties in transition metal dichalcogenides(TMDs).However,there still lacks enough knowledge about how the intercalated atoms directly impact the two-dimensional structural layers and modulate the band structures therein.Taking advantage of X-ray absorption fine structure and angle-resolved photoemission spectroscopy,we studied how Cu intercalation influences the host TaSe2 layers in Cu0.03TaSe2 crystals.The intercalated Cu atoms form bonds with Se of the host layers,and there is charge transfer from Cu to Se.By examining the changes of band dispersions,we show that the variation of electronic structures is beyond a simple rigid band model with merely charge doping effect.This work'reveals that the unusual change of band dispersions is associated with the formation of bonds between the intercalated metal elements and anion ions in the host layers,and provides a reference for the comprehensive understanding of the electronic structures in intercalated materials.

关 键 词：transition metal dichalcogenides Cu-intercalation band shift angle resolved photoemission spectroscopy 

分 类 号：TB31[一般工业技术—材料科学与工程]