中国物理B ›› 2025, Vol. 34 ›› Issue (6): 67102-067102.doi: 10.1088/1674-1056/adc6f6

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Interacting Dirac semi-metal state in nonsymmorphic Kondo-lattice compound CeAgSb2

Da-Liang Guo(郭达良)1,2,†, and Huan Li(黎欢)1,2,‡   

  1. 1 College of Physics and Electronic Information Engineering, Guilin University of Technology, Guilin 541004, China;
    2 Key Laboratory of Low-dimensional Structural Physics and Application, Education Department of Guangxi Zhuang Autonomous Region, Guilin 541004, China
  • 收稿日期:2025-01-18 修回日期:2025-03-23 接受日期:2025-03-31 出版日期:2025-05-16 发布日期:2025-06-16
  • 通讯作者: Da-Liang Guo, Huan Li E-mail:guo22@glut.edu.cn;lihuan@glut.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 12364023) and the Natural Science Foundation of Guangxi Zhuang Autonomous Regin, China (Grant No. 2024GXNSFAA010273).

Interacting Dirac semi-metal state in nonsymmorphic Kondo-lattice compound CeAgSb2

Da-Liang Guo(郭达良)1,2,†, and Huan Li(黎欢)1,2,‡   

  1. 1 College of Physics and Electronic Information Engineering, Guilin University of Technology, Guilin 541004, China;
    2 Key Laboratory of Low-dimensional Structural Physics and Application, Education Department of Guangxi Zhuang Autonomous Region, Guilin 541004, China
  • Received:2025-01-18 Revised:2025-03-23 Accepted:2025-03-31 Online:2025-05-16 Published:2025-06-16
  • Contact: Da-Liang Guo, Huan Li E-mail:guo22@glut.edu.cn;lihuan@glut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 12364023) and the Natural Science Foundation of Guangxi Zhuang Autonomous Regin, China (Grant No. 2024GXNSFAA010273).

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摘要： Dirac node-line (DNL) materials constitute a distinct category of topological semimetals, defined by the linear crossing of valence and conduction bands along one-dimensional lines within the Brillouin zone (BZ), resembling the behavior of Dirac fermions. However, spin-orbit coupling (SOC) and electronic interactions can typically alter these intersections and break the DNLs. In mostly reported cases, DNLs are classified as non-interacting types, which highlights the significant research value in searching for robust interacting DNLs in practical materials. Here, by employing first-principles calculations that combine density functional theory (DFT) with dynamical mean-field theory (DMFT), and leveraging symmetry-based indicator theory, we identify CeAgSb$_2$ as a Dirac semimetal. Our investigation reveals that robust Dirac nodal lines (DNLs) in this Kondo system are driven by Kondo interactions and nonsymmorphic lattice symmetries. Furthermore, our results demonstrate that the properties of these DNLs are substantially modulated by Kondo behavior across varying temperature regimes. The interacting DNLs in CeAgSb$_2$ represents a rare example of Dirac semimetal under electronic correlations, and the peculiar variation of Dirac fermions with temperature provides theoretical reference for future experimental explorations of novel electronic-correlation effects in topological materials.

关键词: heavy-fermions, topological semimetals, dynamical mean-field theory, Kondo effect

Abstract: Dirac node-line (DNL) materials constitute a distinct category of topological semimetals, defined by the linear crossing of valence and conduction bands along one-dimensional lines within the Brillouin zone (BZ), resembling the behavior of Dirac fermions. However, spin-orbit coupling (SOC) and electronic interactions can typically alter these intersections and break the DNLs. In mostly reported cases, DNLs are classified as non-interacting types, which highlights the significant research value in searching for robust interacting DNLs in practical materials. Here, by employing first-principles calculations that combine density functional theory (DFT) with dynamical mean-field theory (DMFT), and leveraging symmetry-based indicator theory, we identify CeAgSb$_2$ as a Dirac semimetal. Our investigation reveals that robust Dirac nodal lines (DNLs) in this Kondo system are driven by Kondo interactions and nonsymmorphic lattice symmetries. Furthermore, our results demonstrate that the properties of these DNLs are substantially modulated by Kondo behavior across varying temperature regimes. The interacting DNLs in CeAgSb$_2$ represents a rare example of Dirac semimetal under electronic correlations, and the peculiar variation of Dirac fermions with temperature provides theoretical reference for future experimental explorations of novel electronic-correlation effects in topological materials.

Key words: heavy-fermions, topological semimetals, dynamical mean-field theory, Kondo effect

中图分类号:  (Strongly correlated electron systems; heavy fermions)

  • 71.27.+a
71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 72.15.Qm (Scattering mechanisms and Kondo effect) 71.10.-w (Theories and models of many-electron systems)