磷烯的极化率和杂质筛选
Polarizability and impurity screening for phosphorene
摘要：
利用磷烯的紧束缚哈密顿量，我们计算了零温（T = 0）下极化率的实部和相应的介电函数Re $[ε(\textbf{q},ω)]$，自由载流子密度为$10^{13}$ / $cm^2$ .我们目前的结果显示在不同方向的转移动量$\bf{q}$的介电函数的实部。当$q$大于费米动量$k_F$的两倍的特定值时，Re $[ε(\textbf{q},ω)]$变得强烈依赖于$\bf{q}$的方向。我们还讨论了室温（T = 300 K）下的情况。这些结果是类似的那些以前报道的其他作者，然后用来确定在磷烯附近的杂质的静电屏蔽。
英文摘要：
Using a tight-binding Hamiltonian for phosphorene, we have calculated the real part of the polarizability and the corresponding dielectric function, Re$[ε(\textbf{q},ω)]$, at zero temperature (T = 0) with free carrier density $10^{13}$/ $cm^2$. We present results showing the real part of dielectric function in different directions of the transferred momentum $\bf{q}$. When $q$ is larger than a particular value which is twice the Fermi momentum $k_F$, Re$[ε(\textbf{q},ω)]$ becomes strongly dependent on the direction of $\bf{q}$. We also discuss the case at room temperature (T = 300K). These results which are similar to those previously reported by other authors are then employed to determine the static shielding of an impurity in the vicinity of phosphorene.
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