Charge-Density-Wave-Induced Bands Renormalization and Energy Gaps in a Kagome Superconductor RbV3Sb5

被引：128

作者：

Liu, Zhonghao ^{[1
,2
]}

Zhao, Ningning ^{[3
,4
]}

Yin, Qiangwei ^{[3
,4
]}

Gong, Chunsheng ^{[3
,4
]}

Tu, Zhijun ^{[3
,4
]}

Li, Man ^{[3
,4
]}

Song, Wenhua ^{[3
,4
]}

Liu, Zhengtai ^{[1
]}

Shen, Dawei ^{[1
,2
]}

Huang, Yaobo ^{[5
]}

Liu, Kai ^{[3
,4
]}

Lei, Hechang ^{[3
,4
]}

Wang, Shancai ^{[3
,4
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China

[3] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

[4] Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China

[5] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201204, Peoples R China

来源：

PHYSICAL REVIEW X | 2021年 / 11卷 / 04期

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

PHASE; FERMIONS;

D O I：

10.1103/PhysRevX.11.041010

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recently discovered Z(2) topological kagome metals AV(3)Sb(5) (A = K, Rb, and Cs) exhibit charge-densitywave (CDW) phases and novel superconducting paring states providing a versatile platform for studying the interplay between electron correlation and quantum orders. Here we directly visualize CDW-induced bands renormalization and energy gaps in RbV3Sb5 using angle-resolved photoemission spectroscopy pointing to the key role of tuning van Hove singularities to the Fermi energy in mechanisms of ordering phases. Near the CDW transition temperature, the bands around the Brillouin zone (BZ) boundary are shifted to high-binding energy, forming an M-shaped band with singularities near the Fermi energy. The Fermi surfaces are partially gapped, and the electronic states on the residual ones should be possibly dedicated to the superconductivity. Our findings are significant in understanding CDW formation and its associated superconductivity.

引用

页数：8

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