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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
New Type of Anticommutative Dynamical Magnetoelectric Response
Maoyuan Wang1, Haiwen Liu2, X C Xie1,3,4
1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
Abstract:
Axion field induced topological magnetoelectric response has attracted lots of attention since it was first proposed by Qi et al. [Phys. Rev. B 78, 195424 (2008).PRBMDO1098-012110.1103/PhysRevB.78.195424]. Here we find a new type of anticommutative magnetoelectric response β^{ξ}(ω), which can induce a dynamical magnetoelectric current driven by a time-varying magnetic field. Unlike the Chern-Simons axion term, this magnetoelectric response term is gauge independent and nonquantized, and manifests in the systems breaking the symmetries of the time reversal, inversion, and mirror. In particular, we propose the antiferromagnetic material Mn_{2}Bi_{2}Te_{5} as a material candidate to observe dynamical magnetoelectric current, in which a large magnetoelectric response term β^{ξ}(ω) originates from band inversion.
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