Magnetically amplified tunneling of the 3rd kind as a probe of   minicharged particles
  We show that magnetic fields significantly enhance a new tunneling mechanism in quantum-field theories with photons coupling to fermionic minicharged particles. We propose a dedicated laboratory experiment of the light-shining-through-walls type that can explore a parameter regime comparable to and even beyond the best model-independent cosmological bounds. With present-day technology, such an experiment is particularly sensitive to minicharged particles with masses in and below the meV regime. 
Babette D\"obrich, Holger Gies, Norman Neitz, Felix Karbstein
hep-ph hep-th quant-ph