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Anisotropic plasmons, Friedel oscillations, and screening in S-Pmmn borophene

机译:S-Pmmn硼苯中的各向异性等离子体激元,Friedel振荡和屏蔽

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摘要

8-Pmmn borophene is a polymorph of borophene which hosts an anisotropic tilted Dirac cone. Using a low-energy effective Hamiltonian for borophene, we analytically calculate the density-density response function of borophene and study its anisotropic plasmon dispersion and screening properties. We find that the anisotropic plasmon mode in 8- Pmmn borophene remains undamped for higher energies along the mirror symmetry direction. The Friedel oscillation in borophene is found to decay as r~3 in the large-r limit, with both the amplitude as well as the periodicity of the Friedel oscillations being anisotropic.
机译:8-Pmn硼烷是硼烷的多晶型物,具有各向异性的倾斜狄拉克锥。使用低能量有效的哈密顿量的硼苯,我们分析计算了硼苯的密度-密度响应函数,并研究了其各向异性等离子体激元的色散和筛选性质。我们发现,对于沿镜面对称方向的较高能量,在8-Pmmn的borophene中各向异性等离子体激元模式保持不衰减。研究发现,在大的r极限中,在borophene中的Friedel振荡衰减为r〜3,Friedel振荡的幅度和周期都是各向异性的。

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  • 来源
    《Physical review》 |2017年第3期|035410.1-035410.6|共6页
  • 作者单位

    Department of Physics, Indian Institute of Technology, Kanpur 208016, India;

    Department of Physics, Indian Institute of Technology, Kanpur 208016, India;

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