Transition radiation

Transition radiation occurs when a charged particle with constant velocity crosses an interface between two media with different permittivities and permeabilities. We study how this radiation is modified by the presence of topological insulators.

Electric field:

Current density:

Angular spectral density of the radiation:

Included:

Transition radiation
Vavilov-Čerenkov radiation

We observe an enhancement due to the magnetoelectric effect of TbPO₄. These results could serve for particle detection and search of dark matter.

^{V.L. Ginzburg, I.M. Frank, J. Phys (USSR) 9, 353 (1945); JETP (USSR) 16, 15 (1946)}

^{O.J. Franca Santiago, S.Y. Buhmann, Phys. Rev. B 105, 155120 (2022)}