Existence of an ultraflat band in the charge density wave state of 4Hb-TaS1.3Se0.7

doi:10.1103/PhysRevB.108.115115

	Existence of an ultraflat band in the charge density wave state of 4H_b-TaS_1.3Se_0.7
	Liu, Qingxin 7; Sun, Peihan 7; Meng, Fanyu 7; Geng, Yanyan 7; Liu, Zhonghao 5,6; Zhang, Jianfeng 4; Gao, Jingjing 3; Jiang, Zhicheng 6; Tian, Shangjie 7; Luo, Xuan 3
刊名	PHYSICAL REVIEW B
	2023-09-08
卷号	108
ISSN号	2469-9950
DOI	10.1103/PhysRevB.108.115115
通讯作者	Cheng, Zhihai(zhihaicheng@ruc.edu.cn)
英文摘要	A flat band is an electronic state with quenched kinetic energy and an extremely high density of states. In such a state, a small electron-electron correlation can drive multiple intriguing quantum phenomena. By using angle-resolved photoemission spectroscopy, we report the existence of a dispersionless flat band with a sharp quasiparticle peak below EF in the charge density wave state of 4Hb-TaS1.3Se0.7. This band extends over the ./ ./ 13 � 13 reconstructed Brillouin zone. In combination with the density functional theory calculation, we identify that the flat band is due to the formation of the Star of David at the top-most T layer. In addition, the scanning tunneling spectroscopy observes a sharp peak above EF. We attribute it to the electron-correlationdriven splitting, forming a small gap of -45 meV. Our observation of the flat band and splitting in 4Hb-TaS1.3Se0.7 provides a platform to manipulate the electron-correlation-related quantum phenomena at a low energy scale.
资助项目	National Natural Science Foundation of China[12274455] ; National Natural Science Foundation of China[12174443] ; National Natural Science Foundation of China[12222413] ; National Natural Science Foundation of China[11674326] ; National Natural Science Foundation of China[11874357] ; National Key R&D Program of China[2022YFA1403800] ; National Key R&D Program of China[2017YFA0302903] ; National Key R&D Program of China[2018YFE0202600] ; National Key R&D Program of China[2022YFA1403203] ; National Key R&D Program of China[2022YFB3608000] ; National Key R&D Program of China[2021YFA1600201] ; Beijing Natural Science Foundation[Z200005] ; Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences' Large -Scale Scientific Facility[U1832141] ; Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences' Large -Scale Scientific Facility[U1932217] ; Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences' Large -Scale Scientific Facility[U2032215] ; Natural Science Foundation of Shanghai[22ZR1473300] ; Natural Science Foundation of Shanghai[23ZR1482200] ; Fundamental Research Funds for the Central Universities ; Research Funds of Renmin University of China[18XNLG14] ; Research Funds of Renmin University of China[21XNLG27] ; Research Funds of Renmin University of China[19XNLG17]
WOS关键词	FLAT-BAND ; FERROMAGNETISM ; GRAPHENE ; MODELS
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:001077758300003
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; Beijing Natural Science Foundation ; Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences' Large -Scale Scientific Facility ; Natural Science Foundation of Shanghai ; Fundamental Research Funds for the Central Universities ; Research Funds of Renmin University of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/133481]
专题	中国科学院合肥物质科学研究院
通讯作者	Cheng, Zhihai
作者单位	1.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, High Magnet Lab, HFIPS, Hefei 230031, Peoples R China 3.Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, HFIPS, Hefei 230031, Peoples R China 4.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 5.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China 6.Chinese Acad Sci, State Key Lab Funct Mat Informat, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China 7.Renmin Univ China, Dept Phys, Key Lab Quantum State Construct & Manipulat, Minist Educ, Beijing 100872, Peoples R China
推荐引用方式 GB/T 7714	Liu, Qingxin,Sun, Peihan,Meng, Fanyu,et al. Existence of an ultraflat band in the charge density wave state of 4H_b-TaS_1.3Se_0.7[J]. PHYSICAL REVIEW B,2023,108.
APA	Liu, Qingxin.,Sun, Peihan.,Meng, Fanyu.,Geng, Yanyan.,Liu, Zhonghao.,...&Wang, Shancai.(2023).Existence of an ultraflat band in the charge density wave state of 4H_b-TaS_1.3Se_0.7.PHYSICAL REVIEW B,108.
MLA	Liu, Qingxin,et al."Existence of an ultraflat band in the charge density wave state of 4H_b-TaS_1.3Se_0.7".PHYSICAL REVIEW B 108(2023).