Magnetic-field modulation of topological electronic state and emergent magneto-transport in a magnetic Weyl semimetal

Jianlei Shen; Jiacheng Gao; Changjiang Yi; Meng Li; Shen Zhang; Jinying Yang; Binbin Wang; Min Zhou; Rongjin Huang; Hongxiang Wei; Haitao Yang; Youguo Shi; Xiaohong Xu; Hong-Jun Gao; Baogen Shen; Geng Li; Zhijun Wang; Enke Liu

doi:10.1016/j.xinn.2023.100399

Magnetic-field modulation of topological electronic state and emergent magneto-transport in a magnetic Weyl semimetal

Innovation (Camb). 2023 Feb 20;4(2):100399. doi: 10.1016/j.xinn.2023.100399. eCollection 2023 Mar 13.

Authors

Jianlei Shen^{1

2}, Jiacheng Gao^{1

3}, Changjiang Yi¹, Meng Li^{1

3}, Shen Zhang^{1

3}, Jinying Yang^{1

3}, Binbin Wang¹, Min Zhou⁴, Rongjin Huang⁴, Hongxiang Wei¹, Haitao Yang¹, Youguo Shi^{1

5}, Xiaohong Xu², Hong-Jun Gao^{1

5}, Baogen Shen^{1

3

6

7}, Geng Li^{1

5}, Zhijun Wang^{1

3}, Enke Liu^{1

5}

Affiliations

¹ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
² Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education & Research Institute of Materials Science, Shanxi Normal University, Taiyuan 030000, China.
³ School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
⁴ Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
⁵ Songshan Lake Materials Laboratory, Dongguan 523808, China.
⁶ Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China.
⁷ Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, China.

Abstract

The modulation of topological electronic state by an external magnetic field is highly desired for condensed-matter physics. Schemes to achieve this have been proposed theoretically, but few can be realized experimentally. Here, combining transverse transport, theoretical calculations, and scanning tunneling microscopy/spectroscopy (STM/S) investigations, we provide an observation that the topological electronic state, accompanied by an emergent magneto-transport phenomenon, was modulated by applying magnetic field through induced non-collinear magnetism in the magnetic Weyl semimetal EuB₆. A giant unconventional anomalous Hall effect (UAHE) is found during the magnetization re-orientation from easy axes to hard ones in magnetic field, with a UAHE peak around the low field of 5 kOe. Under the reasonable spin-canting effect, the folding of the topological anti-crossing bands occurs, generating a strong Berry curvature that accounts for the observed UAHE. Field-dependent STM/S reveals a highly synchronous evolution of electronic density of states, with a dI/dV peak around the same field of 5 kOe, which provides evidence to the folded bands and excited UAHE by external magnetic fields. This finding elucidates the connection between the real-space non-collinear magnetism and the k-space topological electronic state and establishes a novel manner to engineer the magneto-transport behaviors of correlated electrons for future topological spintronics.