Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome Metal FeGe

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外文摘要：We theoretically study the charge order and orbital magnetic properties of a new type of antiferromagnetic kagome metal FeGe.Based on first-principles density functional theory calculations,we study the electronic structures,Fermi-surface quantum fluctuations,as well as phonon properties of the antiferromagnetic kagome metal FeGe.It is found that charge density wave emerges in such a system due to a subtle cooperation be-tween electron-electron interactions and electron-phonon couplings,which gives rise to an unusual scenario of interaction-triggered phonon instabilities,and eventually yields a charge density wave(CDW)state.We further show that,in the CDW phase,the ground-state current density distribution exhibits an intriguing star-of-David pattern,leading to flux density modulation.The orbital fluxes(or current loops)in this system emerge as a result of the subtle interplay between magnetism,lattice geometries,charge order,and spin-orbit coupling(SOC),which can be described by a simple,yet universal,tight-binding theory including a Kane-Mele-type SOC term and a magnetic exchange interaction.We further study the origin of the peculiar step-edge states in FeGe,which sheds light on the topological properties and correlation effects in this new type of kagome antiferromagnetic material.

作者：

马海洋、殷嘉鑫、M.Zahid Hasan、刘健鹏

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作者单位：

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

ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China

Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area,Shenzhen 518045,China

Laboratory for Topological Quantum Matter and Advanced Spectroscopy(B7),Department of Physics,Princeton University,Princeton,New Jersey 08544,USA

Princeton Institute for Science and Technology of Materials,Princeton University,Princeton,New Jersey 08544,USA

Materials Sciences Division,Lawrence Berkeley National Laboratory,Berkeley,California 94720,USA

Liaoning Academy of Materials,Shenyang 110167,China

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基金：

国家自然科学基金国家重点研发计划上海市科委项目Start-Up Grant of ShanghaiTech University

项目编号：

121742572020YFA030960121JC1405100

出版年：

2024

DOI：

10.1088/0256-307X/41/4/047103

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(4)

参考文献量56