The discovery of three-dimensional Van Hove singularity.

Wu, Wenbin; Shi, Zeping; Ozerov, Mykhaylo; Du, Yuhan; Wang, Yuxiang; Ni, Xiao-Sheng; Meng, Xianghao; Jiang, Xiangyu; Wang, Guangyi; Hao, Congming; Wang, Xinyi; Zhang, Pengcheng; Pan, Chunhui; Pan, Haifeng; Sun, Zhenrong; Yang, Run; Xu, Yang; Hou, Yusheng; Yan, Zhongbo; Zhang, Cheng; Lu, Hai-Zhou; Chu, Junhao; Yuan, Xiang

Wu, Wenbin; Shi, Zeping; Ozerov, Mykhaylo; Du, Yuhan; Wang, Yuxiang; Ni, Xiao-Sheng; Meng, Xianghao; Jiang, Xiangyu; Wang, Guangyi; Hao, Congming; Wang, Xinyi; Zhang, Pengcheng; Pan, Chunhui; Pan, Haifeng; Sun, Zhenrong; Yang, Run; Xu, Yang; Hou, Yusheng; Yan, Zhongbo; Zhang, Cheng; Lu, Hai-Zhou; Chu, Junhao; Yuan, Xiang.

Afiliação

Wu W; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Shi Z; Key Laboratory of Polar Materials and Devices, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China.
Ozerov M; Shanghai Center of Brain-Inspired Intelligent Materials and Devices, East China Normal University, 200241, Shanghai, China.
Du Y; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Wang Y; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA.
Ni XS; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Meng X; State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, 200433, Shanghai, China.
Jiang X; Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China.
Wang G; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Hao C; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Wang X; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Zhang P; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Pan C; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Pan H; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Sun Z; Multifunctional Platform for Innovation Precision Machining Center, East China Normal University, 200241, Shanghai, China.
Yang R; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Xu Y; State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
Hou Y; Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, 211189, Nanjing, China.
Yan Z; Key Laboratory of Polar Materials and Devices, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China.
Zhang C; Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China.
Lu HZ; Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China.
Chu J; State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, 200433, Shanghai, China.
Yuan X; Zhangjiang Fudan International Innovation Center, Fudan University, 201210, Shanghai, China.

Nat Commun ; 15(1): 2313, 2024 Mar 14.

Article em En | MEDLINE | ID: mdl-38485978

ABSTRACT

ABSTRACT

Arising from the extreme/saddle point in electronic bands, Van Hove singularity (VHS) manifests divergent density of states (DOS) and induces various new states of matter such as unconventional superconductivity. VHS is believed to exist in one and two dimensions, but rarely found in three dimension (3D). Here, we report the discovery of 3D VHS in a topological magnet EuCd2As2 by magneto-infrared spectroscopy. External magnetic fields effectively control the exchange interaction in EuCd2As2, and shift 3D Weyl bands continuously, leading to the modification of Fermi velocity and energy dispersion. Above the critical field, the 3D VHS forms and is evidenced by the abrupt emergence of inter-band transitions, which can be quantitatively described by the minimal model of Weyl semimetals. Three additional optical transitions are further predicted theoretically and verified in magneto-near-infrared spectra. Our results pave the way to exploring VHS in 3D systems and uncovering the coordination between electronic correlation and the topological phase.

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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China

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