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

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

1995-08-21

arxiv.org/abs/cond-mat/9508082v1

Phys. Rev. Lett., Vol.75, 2766 (1995)

Physics

Condensed Matter

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.75.2766

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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