中国物理B ›› 2022, Vol. 31 ›› Issue (11): 117303-117303.doi: 10.1088/1674-1056/ac6b2d

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Anisotropic plasmon dispersion and damping in multilayer 8-Pmmn borophene structures

Kejian Liu(刘可鉴)1, Jian Li(李健)1,2,3, Qing-Xu Li(李清旭)1,2, and Jia-Ji Zhu(朱家骥)1,2,3,†   

  1. 1 School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
    2 Institute for Advanced Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
    3 Southwest Center for Theoretical Physics, Chongqing University, Chongqing 401331, China
  • 收稿日期:2022-04-02 接受日期:2022-04-28 出版日期:2022-10-17 发布日期:2022-10-25
  • 通讯作者: Jia-Ji Zhu E-mail:zhujj@cqupt.edu.cn
  • 基金资助:
    This work was supported by the Scientific Research Program from Science and Technology Bureau of Chongqing City (Grant No. cstc2020jcyj-msxmX0684), the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202000639), and in part by the National Natural Science Foundation of China (Grant No. 12147102).

Anisotropic plasmon dispersion and damping in multilayer 8-Pmmn borophene structures

Kejian Liu(刘可鉴)1, Jian Li(李健)1,2,3, Qing-Xu Li(李清旭)1,2, and Jia-Ji Zhu(朱家骥)1,2,3,†   

  1. 1 School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
    2 Institute for Advanced Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
    3 Southwest Center for Theoretical Physics, Chongqing University, Chongqing 401331, China
  • Received:2022-04-02 Accepted:2022-04-28 Online:2022-10-17 Published:2022-10-25
  • Contact: Jia-Ji Zhu E-mail:zhujj@cqupt.edu.cn
  • Supported by:
    This work was supported by the Scientific Research Program from Science and Technology Bureau of Chongqing City (Grant No. cstc2020jcyj-msxmX0684), the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202000639), and in part by the National Natural Science Foundation of China (Grant No. 12147102).

摘要: We investigate the collective plasma oscillations theoretically in multilayer 8-Pmmn borophene structures, where the tilted Dirac electrons in spatially separated layers are coupled via the Coulomb interaction. We calculate the energy dispersions and Landau dampings of the multilayer plasmon excitations as a function of the total number of layers, the interlayer separation, and the different orientations. Like multilayer graphene, the plasmon spectrum in multilayer borophene consists of one in-phase optical mode and N - 1 out-of-phase acoustical modes. We show that the plasmon modes possess kinks at the boundary of the interband single-particle continuum and the apparent anisotropic behavior. All the plasmon modes approach the same dispersion at a sufficiently large interlayer spacing in the short-wavelength limit. Especially along specific orientations, the optical mode could touch an energy maximum in the nondamping region, which shows non-monotonous behavior. Our work provides an understanding of the multilayer borophene plasmon and may pave the way for multilayer borophene-based plasmonic devices.

关键词: plasmon, 8-Pmmn borophene, multilayer, two-dimensional materials

Abstract: We investigate the collective plasma oscillations theoretically in multilayer 8-Pmmn borophene structures, where the tilted Dirac electrons in spatially separated layers are coupled via the Coulomb interaction. We calculate the energy dispersions and Landau dampings of the multilayer plasmon excitations as a function of the total number of layers, the interlayer separation, and the different orientations. Like multilayer graphene, the plasmon spectrum in multilayer borophene consists of one in-phase optical mode and N - 1 out-of-phase acoustical modes. We show that the plasmon modes possess kinks at the boundary of the interband single-particle continuum and the apparent anisotropic behavior. All the plasmon modes approach the same dispersion at a sufficiently large interlayer spacing in the short-wavelength limit. Especially along specific orientations, the optical mode could touch an energy maximum in the nondamping region, which shows non-monotonous behavior. Our work provides an understanding of the multilayer borophene plasmon and may pave the way for multilayer borophene-based plasmonic devices.

Key words: plasmon, 8-Pmmn borophene, multilayer, two-dimensional materials

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 73.21.Ac (Multilayers) 68.65.-k (Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)