首页|Magnetic Topological Dirac Semimetal Transition Driven by SOC in EuMg2Bi2

Magnetic Topological Dirac Semimetal Transition Driven by SOC in EuMg2Bi2

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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 EuMg2Bi2 using first-principles calculations and angle-resolved photoemission spectroscopy.Our calculations reveal that the spin-orbit coupling(SOC)in EuMg2Bi2 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 6p orbitals,are observed on both the(001)and(100)surfaces,confirming that EuMg2Bi2 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.

王佳萌、钱浩吉、姜琦、乔山、叶茂

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State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China

Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

Research Center for Intelligent Chips and Devices,Zhejiang Lab,Hangzhou 311121,China

Center for Transformative Science,ShanghaiTech University,Shanghai 201210,China

School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China

Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China

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国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金ARPES experiments were performed with the approval of the Proposal Assessing Committee of SiP.ME2 platform project国家自然科学基金

2022YFA1604302U163226611927807U2032207Proposal 11227902

2024

10.1088/0256-307X/41/1/017101

中国物理快报(英文版)
中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI
影响因子：0.515
ISSN：0256-307X
年,卷(期)：2024.41(1)
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