Casimir repulsion between Topological Insulators in the diluted regime

Abstract

The Pairwise Summation Approximation (PSA) of Casimir energy is applied to a system of two dielectrics with magnetoelectric coupling. In particular, the case of Topological Insulators (TI) is studied in detail. Depending on the the optical response of the TI, we obtain a stable equilibrium distance, atraction for all distances, or repulsion for all distances at zero temperature. This equilibrium distance disappears in the high temperature limit. These results are independent on the geometry of the TI, but are only valid in the diluted approximation.

6 pages, 4 figures

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• Van der Waals torque and force between anisotropic topological insulator slabs
• Switching the sign of the Casimir force between two PEMC spheres
• On the (im)possibility of Casimir repulsion between Chern-Simons surfaces