$8-Pmmn$硼化物中的各向异性等离子体激元、Friedel振荡和动力学屏蔽
Anisotropic plasmons, Friedel oscillations and dynamical screening in $8-Pmmn$ borophene
摘要：
$8-Pmmn$硼化物是硼化物的多晶型物，其具有各向异性倾斜狄拉克锥。利用硼化物的低能有效哈密顿量，解析计算了硼化物的密度-密度响应函数，研究了其各向异性等离子体色散和屏蔽特性。我们发现在$8-Pmmn$硼化物中的各向异性等离子体激元模式，在较高的能量下沿镜像对称方向保持无阻尼。在大的$r$极限下，硼化物中的Friedel振荡衰减为$r^{-3}$，Friedel振荡的振幅和周期都是各向异性的.
英文摘要：
$8-Pmmn$ 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.
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