| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetic Topological Dirac Semimetal Transition Driven by SOC in EuMg$_2$Bi$_2$ |
| J. M. Wang1,2, H. J. Qian3, Q. Jiang4, S. Qiao1,2,5*, and M. Ye6,1,2* |
1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3Research Center for Intelligent Chips and Devices, Zhejiang Lab, Hangzhou 311121, China
4Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
5School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
6Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
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| Cite this article: |
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J. M. Wang, H. J. Qian, Q. Jiang et al 2024 Chin. Phys. Lett. 41 017101 |
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Abstract Magnetic topological semimetals have been at the forefront of condensed matter physics due to their ability to exhibit exotic transport phenomena. Investigating the interplay between magnetic and topological orders in systems with broken time-reversal symmetry is crucial for realizing non-trivial quantum effects. We delve into the electronic structure of the rare-earth-based antiferromagnetic Dirac semimetal EuMg$_2$Bi$_2$ using first-principles calculations and angle-resolved photoemission spectroscopy. Our calculations reveal that the spin–orbit coupling (SOC) in EuMg$_2$Bi$_2$ prompts an insulator to topological semimetal transition, with the Dirac bands protected by crystal symmetries. The linearly dispersive states near the Fermi level, primarily originating from Bi 6$p$ orbitals, are observed on both the (001) and (100) surfaces, confirming that EuMg$_2$Bi$_2$ is a three-dimensional topological Dirac semimetal. This research offers pivotal insights into the interplay between magnetism, SOC and topological phase transitions in spintronics applications.
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Received: 12 October 2023
Published: 07 January 2024
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| PACS: |
71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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73.20.-r
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(Electron states at surfaces and interfaces)
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73.20.At
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(Surface states, band structure, electron density of states)
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