Mass Acquisition of Dirac Fermions in Bi4I4 by Spontaneous Symmetry Breaking

被引：0

作者：

Yang, Ming ^{[1
]}

Zhao, Wenxuan ^{[2
]}

Mu, Dan ^{[3
,4
]}

Shi, Zhijian ^{[1
]}

Zhong, Jingyuan ^{[1
]}

Li, Yaqi ^{[1
]}

Liu, Yundan ^{[3
,4
]}

Zhong, Jianxin ^{[3
,4
,5
]}

Cheng, Ningyan ^{[6
]}

Zhou, Wei ^{[7
]}

Wang, Jianfeng ^{[1
]}

Shi, Yan ^{[8
]}

Sun, Ying ^{[1
]}

Hao, Weichang ^{[1
]}

Yang, Lexian ^{[2
]}

Zhuang, Jincheng ^{[1
]}

Du, Yi ^{[1
]}

机构：

[1] Beihang Univ, Sch Phys, Beijing 100191, Peoples R China

[2] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[3] Xiangtan Univ, Hunan Key Lab Micronano Energy Mat & Devices, Xiangtan 411105, Hunan, Peoples R China

[4] Xiangtan Univ, Sch Phys & Optoelect, Xiangtan 411105, Hunan, Peoples R China

[5] Shanghai Univ, Inst Quantum Sci & Technol, Shanghai 200444, Peoples R China

[6] Anhui Univ, Inst Phys Sci & Informat Technol, Informat Mat & Intelligent Sensing Lab Anhui Prov, Key Lab Struct & Funct Regulat Hybrid Mat,Minist E, Hefei 230601, Peoples R China

[7] Changshu Inst Technol, Sch Elect & Informat Engn, Changshu 215500, Peoples R China

[8] Beihang Univ, Sch Automat Sci & Elect Engn, Beijing 100191, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2024年 / 133卷 / 25期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

TOPOLOGICAL INSULATOR; PHASE-TRANSITION; SURFACE;

D O I：

10.1103/PhysRevLett.133.256601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Massive Dirac fermions, which are essential for realizing novel topological phenomena, are expected to be generated from massless Dirac fermions by breaking the related symmetry, such as time-reversal symmetry in topological insulators or crystal symmetry in topological crystalline insulators. Here, we report scanning tunneling microscopy and angle-resolved photoemission spectroscopy studies of alpha-Bi4I4, which reveals the realization of massive Dirac fermions in the (100) surface states without breaking the time-reversal symmetry. Combined with first-principles calculations, our experimental results indicate that the spontaneous symmetry breaking engenders two nondegenerate edge states at the opposite sides of monolayer Bi4I4 after the structural phase transition, imparting mass to the Dirac fermions after taking the interlayer coupling into account. Our results not only demonstrate the formation of the massive Dirac fermions by spontaneous symmetry breaking, but also imply the potential for the engineering of Dirac fermions for device applications.

引用

页数：7

共 55 条

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