Abstract:
:Electrodynamic responses from three-dimensional topological insulators are characterized by the universal magnetoelectric term constituent of the Lagrangian formalism. The quantized magnetoelectric coupling, which is generally referred to as topological magnetoelectric effect, has been predicted to induce exotic phenomena including the universal low-energy magneto-optical effects. Here we report the experimental indication of the topological magnetoelectric effect, which is exemplified by magneto-optical Faraday and Kerr rotations in the quantum anomalous Hall states of magnetic topological insulator surfaces by terahertz magneto-optics. The universal relation composed of the observed Faraday and Kerr rotation angles but not of any material parameters (for example, dielectric constant and magnetic susceptibility) well exhibits the trajectory towards the fine structure constant in the quantized limit.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Okada KN,Takahashi Y,Mogi M,Yoshimi R,Tsukazaki A,Takahashi KS,Ogawa N,Kawasaki M,Tokura Ydoi
10.1038/ncomms12245subject
Has Abstractpub_date
2016-07-20 00:00:00pages
12245issn
2041-1723pii
ncomms12245journal_volume
7pub_type
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