paper

Necessity of Time-Reversal Symmetry Breaking for the Polar Kerr Effect in Linear Response

arXiv:1507.03555 · doi:10.1103/PhysRevLett.116.093903

Abstract

We show that, measured in a backscattering geometry, the polar Kerr effect is absent if the nonlocal electromagnetic response function respects Onsager symmetry, characteristic of thermodynamic states that preserve time-reversal symmetry. A key element is an expression for the reflectivity tensor in terms of the retarded Green's function.

7 pages, 1 figure. minor changes

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