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arXiv · 1201.5503

Impact of the Dzyaloshinskii-Moriya interaction in strongly correlated itinerant systems

Sergej Schuwalow·Christoph Piefke·Frank Lechermann
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Abstract

Spin-only approaches to anisotropic effects in strongly interacting materials are often insufficient for systems close to the Mott regime. Within a model context, here the consequences of the low-symmetry relevant Dzyaloshinskii-Moriya (DM) interaction are studied for strongly correlated, but overall itinerant, systems. Namely, we investigate the Hubbard bilayer model supplemented by a DM term at half filling and in the hole-doped regime. As an add-on, further results for the two- impurity Anderson model with DM interaction are also provided. The model Hamiltonians are treated by means of the rotational invariant slave boson technique at saddle point within a (cellular) cluster approach. Already small values of the anisotropic interaction prove to have a strong influence on the phases and correlation functions with increasing U. An intriguing metallic spin-flop phase is found in the doped bilayer model and a reduction of the RKKY exchange in the two-impurity model.

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Sergej Schuwalow, Christoph Piefke, Frank Lechermann. 2012-01-26. Impact of the Dzyaloshinskii-Moriya interaction in strongly correlated itinerant systems. https://doi.org/10.1103/physrevb.85.205132

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