Terahertz spectroscopy on Faraday and Kerr rotations in a quantum anomalous Hall state.

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 Commun

journal_title

Nature communications

authors

Okada KN,Takahashi Y,Mogi M,Yoshimi R,Tsukazaki A,Takahashi KS,Ogawa N,Kawasaki M,Tokura Y

doi

10.1038/ncomms12245

subject

Has Abstract

pub_date

2016-07-20 00:00:00

pages

12245

issn

2041-1723

pii

ncomms12245

journal_volume

7

pub_type

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