Anisotropic plasmons, Friedel oscillations and dynamical screening in $8-Pmmn$ borophene
Anisotropic plasmons, Friedel oscillations and dynamical screening in $8-Pmmn$ borophene
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DOI：
10.1103/physrevb.96.035410
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发表时间：
2017-05
影响因子：
3.7
通讯作者：
Krishanu Sadhukan;A. Agarwal
中科院分区：
文献类型：
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作者：
Krishanu Sadhukan;A. Agarwal
硼罗芬是硼罗芬的多晶型，具有各向异性倾斜的狄拉克锥。利用硼罗芬的低能量有效哈密顿量，分析计算了硼罗芬的密度-密度响应函数，并研究了其各向异性等离子体色散和筛选特性。我们发现$8-Pmmn$ borophene的各向异性等离子体模式在沿镜面对称方向的高能量下保持无阻尼。硼罗芬中的弗里德尔振荡在较大的r极限下衰减为$r^{-3}$，其振幅和周期性均为各向异性。
$8-Pmmn$ 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.