包封磷烯中的等离子体声子极化激元
Plasmon-phonon-polaritons in encapsulated phosphorene
摘要：
我们考虑了一个由掺杂的单层磷烯嵌入在两个六方氮化硼（hBN）板沿异质结构方向的系统。基于有限温度下的无规相位近似，计算了该混合系统的等离子体激元-极化激元和等离子体激元-声子-极化激元模的波矢方位角依赖关系。集体模表现出较强的各向异性和与极性介质声子模的强耦合，并且当等离子体激元进入带内电子-空穴连续区时，由于带内过程而产生朗道阻尼.我们的数值计算结果表明，等离子体激元模式是高度局限于表面沿锯齿形方向。由于强的电子-声子相互作用，在Reststrahlen带的声子色散也是角度相关的。这些结果也与我们计算的半经典模型的结果一致。
英文摘要：
We consider a system consists of a doped monolayer phosphorene embedded between two hexagonal Boron Nitride (hBN) slabs along the heterostructure direction. The wavevector azimuthal angle dependence of the plasmon-polariton and plasmon-phonon-polariton modes of the hybrid system are calculated based on the random phase approximation at finite temperature. The collective modes illustrate strong anisotropy and strong coupling with phonon modes of the polar media and furthermore, the Landau damping occurs due to the intraband processes when plasmon enters intraband electron-hole continuum. Our numerical results show that the plasmon mode is highly confined to the surface along the zigzag direction. Owing to the strong electron-phonon interaction, the phonon dispersions in the Reststrahlen bands are also angle-dependent. These results are also in agreement with those of the semiclassical model obtained in our calculations.
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