Using bispherical coordinates and perturbative methods, the paper derives closed-form expressions for the magnetoelectric-induced magnetic fields around two interacting topological insulator spheres to leading order in the coupling constant.
As a consequence, only bispherical harmonics with azimuthal indexm= 1contribute, and the angular structure is entirely captured by the combinationP 1 n(cosξ) sinϕ
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Electromagnetic response of two interacting topological insulator spheres in external fields
Using bispherical coordinates and perturbative methods, the paper derives closed-form expressions for the magnetoelectric-induced magnetic fields around two interacting topological insulator spheres to leading order in the coupling constant.