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Achieving strong repulsive Casimir forces through engineered coatings canpave the way for micro- and nano-electromechanical applications where adhesiveforces currently cause reliability issues. Here, we exploit Lifshitz theory toidentify the requirements for repulsive Casimir forces in gyrotropic media fortwo limiting cases (ultra-strong gyroelectric and non-gyroelectric). We showthat the origin of repulsive force in media with strong gyrotropy such as Weylsemi-metals arises from the giant interconversion of polarization of vacuumfluctuations.

Origin of the repulsive Casimir force in giant polarization-interconversion materials