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

Article

关键词: 2-IMPURITY ANDERSON MODEL;    WEAK FERROMAGNETISM;    HUBBARD-MODEL;    SPIN-ROTATION;    MONTE-CARLO;    SLAVE-BOSON;    ANTIFERROMAGNETISM;    TRANSITION;    EXCHANGE;    LATTICE;   

DOI  :  10.1103/PhysRevB.85.205132

来源: SCIE

【 摘 要 】

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 the 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 Ruderman-Kittel-Kasuya-Yosida exchange is found in the two-impurity model.

【 授权许可】

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