Anti-commutative dynamical magneto-electric response in certain solid state materials
Abstract
Axion field induced topological magneto-electric response has attracted lots of attentions since it was first proposed by Qi et al. in 2008. Here we find a new type of anti-commutative magneto-electric response β(ω), which can induce a dynamical magneto-electric current driven by a time-varying magnetic field. Unlike the Chern-Simons Axion term, this magneto-electric response term is gauge-independent and non-quantized, and manifests in the systems breaking the symmetries of the time-reversal, inversion and mirror. In particular, we propose the antiferromagnetic material Mn2Bi2Te5 as a material candidate to observe dynamical magneto-electric current, in which a large magneto-electric response term β(ω) originates from band inversion.
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