The second Wien effect: non-linear response of Coulomb systems from electrolytes to frustrated magnets
Fluids and Materials Seminar
7th March 2018, 2:00 pm – 3:00 pm
Electric field can increase conductivity of electrolytes by liberating ions that are electrostatically paired in equilibrium. Despite this so-called second Wien effect being beyond linear response, Onsager gave its exact solution on the two-ion level. I will show how Monte Carlo simulations of lattice electrolytes help uncover many-body corrections to Onsager's solution . I will then focus on applications of the second Wien effect to spin ice, one of the many of materials where it occurs. Spin ice is a three-dimensional frustrated magnet with quasiparticles that carry topological and magnetic charge -- magnetic monopoles -- that can be collectively seen as a magnetic electrolyte. The second Wien effect can then be applied to predict is non-linear non-equilibrium response .
 V. Kaiser, et al., Nat. Materials 12 1033-1037 (2013).
 V. Kaiser et al., Phys. Rev. Lett. 115 037201 (2015).