Dynamical magnetoelectric coupling in axion insulator thin films

Abstract

Axion insulator is an exotic magnetic topological insulator with zero Chern number but a nonzero quantized Chern-Simons magnetoelectric coupling. A conclusive experimental evidence for axion insulators is still lacking due to the small signal of topological magnetoelectric effect (TME). Here we show that the dynamical magnetoelectric coupling can be induced by the \emph{out-of-plane} surface magnetization dynamics in axion insulator thin films, which further generates a polarization current in the presence of an external magnetic field in the same direction. Such a current is finite in the bulk and increases as the film thickness $d$ decreases, in opposite to TME current which decreases as $d$ decreases. Remarkably, the current in thin films at magnetic resonance is at least ten times larger than that of TME, and thus may serve as a smoking gun signature for axion insulators.

arXiv comment5 pages, 4 figures

References in corpus (43)

• Topological Insulators
• Topological insulators and superconductors
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Topological Field Theory of Time-Reversal Invariant Insulators
• The Chiral Magnetic Effect
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Prediction and observation of the first antiferromagnetic topological insulator
• Seeing the magnetic monopole through the mirror of topological surface states
• Magnetoelectric polarizability and axion electrodynamics in crystalline insulators
• Topological response in Weyl semimetals and the chiral anomaly
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Experimental realization of an intrinsic magnetic topological insulator
• Dynamical Axion Field in Topological Magnetic Insulators
• Electromagnetic Response of Weyl Semimetals
• Surface quantized anomalous Hall current and magneto-electric effect in magnetically disordered topological insulators
• Quantized Faraday and Kerr rotation and axion electrodynamics of a 3D topological insulator
• Higher-order Topology of Axion Insulator EuIn${}_2$As${}_2$
• Realization of the Axion Insulator State in Quantum Anomalous Hall Sandwich Heterostructures
• Quantized Response and Topology of Insulators with Inversion Symmetry
• Quantized topological magnetoelectric effect of the zero-plateau quantum anomalous Hall state
• Tailoring tricolor structure of magnetic topological insulator for robust axion insulator
• Observation of the universal magnetoelectric effect in a 3D topological insulator
• Surfaces of Axion Insulators
• Topological magneto-electric effects in thin films of topological insulators
• Competing magnetic interactions in the antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Computational Design of Axion Insulators Based on 5d Spinels Compounds
• Chern-Simons orbital magnetoelectric coupling in generic insulators
• Electric-Magnetic Duality and Topological Insulators
• Scaling of the Quantum Anomalous Hall Effect as an Indicator of Axion Electrodynamics
• The Axion Insulator as a Pump of Fragile Topology
• Prediction of Weyl semimetal, AFM topological insulator, nodal line semimetal, and Chern insulator phases in Bi2MnSe4
• Large dynamical axion field in topological antiferromagnetic insulator Mn${}_2$Bi${}_2$Te${}_5$
• Instability in magnetic materials with dynamical axion field
• Chiral Magnetic Effect and Anomalous Hall Effect in Antiferromagnetic Insulators with Spin-Orbit Coupling
• Dynamical Axion Field in a Magnetic Topological Insulator Superlattice
• Topological Insulators Avoid the Parity Anomaly
• Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator
• Anisotropic topological magnetoelectric effect in axion insulators
• Axion coupling in the hybrid Wannier representation
• Magnetic-Resonance-Induced Pseudo-electric Field and Giant Current Response in Axion Insulators
• Electromagnetic effects induced by time-dependent axion field
• Time-reversal-symmetric topological magnetoelectric effect in three-dimensional topological insulators

Cited by in corpus (5)

• Observation of the Axion quasiparticle in 2D MnBi${}_2$Te${}_4$
• Dynamical Piezomagnetic Effect in Time-Reversal Invariant Weyl Semimetals with Axionic Charge-Density Waves
• Pseudo-gauge Fields in Dirac and Weyl Materials
• Unoccupied Topological Surface State in MnBi${}_2$Te${}_4$
• Edge optical effect as a probe of chiral topological superconductors