Finite-frequency magnetoelectric response of three-dimensional topological insulators

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Date
2012
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American Physical Society
Abstract
Topological insulators with a time-reversal symmetry-breaking perturbation near the surface present a magnetoelectric response that is quantized when the frequency of the probing fields is much smaller than the surface gap induced by the perturbation. In this work we describe the intrinsic finite-frequency magnetoelectric response of topological insulators for frequencies of the order of and larger than the surface gap, including the experimentally relevant case where the system is metallic. This response affects physical observable quantities and will give rise to new finite-frequency phenomena of intrinsic topological origin.
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Grushin, A. G., & De Juan, F. (2012). Finite-frequency magnetoelectric response of three-dimensional topological insulators. Physical Review B - Condensed Matter and Materials Physics, 86(7), 075126. http://dx.doi.org/10.1103/PhysRevB.86.075126
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© 2012 American Physical Society.
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Article