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A Microscopic Model of Non-Reciprocal Optical Effects in Cr_2 O_3

V. N. Muthukumar·Roser Valenti·Claudius Gros
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Abstract

This manuscript deals with the question "How does light couple to an antiferromagnetic order parameter"? For that we develop a microscopic model that explains the non-reciprocal optical effects in centrosymmetric Cr_2 O_3. It is shown that light can couple {\em directly} to the antiferromagnetic order parameter. This coupling is mediated by the spin-orbit interaction and involves an interplay between the breaking of inversion symmetry due to the antiferromagnetic order parameter and the trigonal field contribution to the ligand field at the Cr^{3+} ion.

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V. N. Muthukumar, Roser Valenti, Claudius Gros. 1995-08-21. A Microscopic Model of Non-Reciprocal Optical Effects in Cr_2 O_3. https://doi.org/10.1103/physrevlett.75.2766

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