On nonlinear classical electrodynamics with an axionic term

Details On nonlinear classical electrodynamics with an axionic term On nonlinear classical electrodynamics with an axionic term

2010-05-27

arxiv.org/abs/1005.5027v3

J.Phys.A44:045401,2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages; v2 Several typos are corrected; v3 title, abstract and introduction are revised

Scientific paper

10.1088/1751-8113/44/4/045401

Recently there has been a renewed interest in axionic generalization of electrodynamics due to its application to topological insulators. A low-energy electromagnetic response of these exotic materials was proposed to be described by an axionic term in the Lagrangian. Motivated by this it is of interest to study various aspects of axionic electrodynamics and analyze the universal features of the axionic effects. Here we discuss the axionic modification of generalized electrodynamics with a Lagrangian being an arbitrary function of two electromagnetic invariants. Surprisingly, the qualitative characteristics of the major axionic effects known in the Maxwell theory happen to be independent of the exact type of the nonlinear Lagrangian and are uniquely fixed by the form of the axionic term.

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