论文标题
均质，各向同性，介电 - 磁性球的电磁散射，具有拓扑绝缘的表面状态
Electromagnetic scattering by homogeneous, isotropic, dielectric-magnetic sphere with topologically insulating surface states
论文作者
论文摘要
通过均匀的各向同性，介电 - 磁性球对电磁散射的洛伦兹（Lorenz-Mie）的表述，扩展了以表面允许$γ$为特征的拓扑绝缘的表面状态。根据入射场拟足体的散射场拟足体的膨胀系数得出了封闭形式的表达。这些膨胀系数用于获得球体总散射，灭绝，正向散射和反向散射效率的分析表达式。当球体是非解剖或弱耗散时，存在相对较低的$γ$值的共振。大 $γ$的值，散射特性几乎接近完美的电导球体，而不管球是由耗散或非隔离材料组成的，无论该材料是否以正相或负相位速度支持PlaneWave的传播。
The Lorenz--Mie formulation of electromagnetic scattering by a homogeneous, isotropic, dielectric-magnetic sphere was extended to incorporate topologically insulating surface states characterized by a surface admittance $γ$. Closed-form expressions were derived for the expansion coefficients of the scattered field phasors in terms of those of the incident field phasors. These expansion coefficients were used to obtain analytical expressions for the total scattering, extinction, forward scattering, and backscattering efficiencies of the sphere. Resonances exist for relatively low values of $γ$, when the sphere is either nondissipative or weakly dissipative. For large values of $γ$, the scattering characteristics are close to that of a perfect electrically conducting sphere, regardless of whether the sphere is composed of a dissipative or nondissipative material, and regardless of whether that material supports planewave propagation with positive or negative phase velocity.
