Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal

Cong Li; Jianfeng Zhang; Yang Wang; Hongxiong Liu; Qinda Guo; Emile Rienks; Wanyu Chen; Francois Bertran; Huancheng Yang; Dibya Phuyal; Hanna Fedderwitz; Balasubramanian Thiagarajan; Maciej Dendzik; Magnus H Berntsen; Youguo Shi; Tao Xiang; Oscar Tjernberg

doi:10.1038/s41467-023-42996-8

Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal

Nat Commun. 2023 Nov 8;14(1):7185. doi: 10.1038/s41467-023-42996-8.

Authors

Cong Li^#^{1

2}, Jianfeng Zhang^#³, Yang Wang^#⁴, Hongxiong Liu^#³, Qinda Guo⁴, Emile Rienks⁵, Wanyu Chen⁴, Francois Bertran⁶, Huancheng Yang⁷, Dibya Phuyal⁴, Hanna Fedderwitz⁸, Balasubramanian Thiagarajan⁸, Maciej Dendzik⁴, Magnus H Berntsen⁴, Youguo Shi³, Tao Xiang³, Oscar Tjernberg⁹

Affiliations

¹ Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden. [email protected].
² Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA. [email protected].
³ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
⁴ Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden.
⁵ Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489, Berlin, Germany.
⁶ Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190, Saint-Aubin, France.
⁷ Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, 100872, China.
⁸ MAX IV Laboratory, Lund University, 22100, Lund, Sweden.
⁹ Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden. [email protected].

^# Contributed equally.

Abstract

Condensed matter physics has often provided a platform for investigating the interplay between particles and fields in cases that have not been observed in high-energy physics. Here, using angle-resolved photoemission spectroscopy, we provide an example of this by visualizing the electronic structure of a noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi in both the paramagnetic and ferrimagnetic states. We observe surface Fermi arcs and bulk Weyl fermion dispersion as well as the emergence of new Weyl fermions in the ferrimagnetic state. Our results establish NdAlSi as a magnetic Weyl semimetal and provide an experimental observation of ferrimagnetic regulation of Weyl fermions in condensed matter.

Abstract

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