Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Metal-Insulator Transition 1

TT 34.5: Vortrag

Mittwoch, 28. März 2012, 17:30–17:45, H 3010

Model study of the Dzyaloshinskii-Moriya interaction in strongly correlated itinerant systems — •Sergej Schuwalow, Christoph Piefke, and Frank Lechermann — 1. Institut für Theoretische Physik, Universität Hamburg

In low symmetry systems, the combination of spin-orbit interaction and broken inversion symmetry may give rise to effective noncollinear magnetic interactions first described in [1,2]. With the recently increasing interest in the effects of spin-orbit coupling, it becomes important to assess the role of such effects in the scope of complex solid state systems with different competing interactions.

Within this work, we investigate the interplay between strong electronic correlations and noncollinear magnetism induced by the Dzyaloshinskii-Moriya interaction in an itinerant model system within the framework of the Rotationally-Invariant Slave-Boson formalism (RISB)[3,4]. It allows us to capture the low-energy physics of the interacting system while retaining full rotational degrees of freedom which are essential for the magnetic structure at hand. Our main focus lies on determining the magnetic properties of the system and their behaviour under the influence of a finite Hubbard U.
Dzyaloshinskii, J. Phys. Chem. Solids 4, 241 (1958).
Moriya, Phys. Rev. 120, 91 (1960).
Lechermann, Georges, Kotliar, Parcollet, PRB 76, 155102 (2007).
Piefke, Boehnke, Georges, Lechermann, PRB 82, 165118 (2010).