David Szaller, Sandor Bordacs, Istvan Kezsmarki
Recent studies have shown that the violation of reciprocity in optical processes can be remarkable in low-symmetry magnetic crystals. These crystals can effectively differentiate between counter-propagating light beams and show directional optical anisotropies -- such as directional dichroism -- in the order of unity. Based on symmetry considerations, we identify the magnetic point groups of materials which can host such directional anisotropy. In most of these cases, we found that the symmetry of the crystal allows non-reciprocity not only for optical processes but also for the propagation of unpolarized beams of particles and scalar waves. We also predict new types of non-reciprocal optical anisotropies -- besides the optical magnetoelectric effect and the magnetochiral dichroism investigated so far -- and specify the magnetic point group of crystals which can host them.
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http://arxiv.org/abs/1211.0530
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