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MA: Fachverband Magnetismus
MA 21: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1
MA 21.5: Talk
Tuesday, March 21, 2017, 10:30–10:45, HSZ 304
Differences in motion of a single hole and a single electron in the quasi-2D iridates — •Ekaterina Paerschke1, Krzysztof Wohlfeld2, Kateryna Foyevtsova3, and Jeroen van den Brink1 — 1IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland — 3University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 Canada
We study the motion of a single charge (hole or electron) added to the (Mott) insulating and antiferromagnetically ordered ground state of the quasi-2D iridates, such as Ba2IrO4 or Sr2IrO4. Using the self-consistent Born approximation applied to the appropriate strong coupling model we show the intrinsic and qualitative differences between the hole and electron cases. On one hand, the added electron forms a spin polaron, which qualitatively resembles the well-known case of the quasi-2D cuprates doped with a single hole or electron. On the other hand, the case with the added hole is far more complex, due to the formation of the 5d4 configuration which may carry finite angular momentum J: here the well-known spin polaronic physics is modified due to the additional degrees of freedom and the possibility of the free hole motion between the different AF sublattices. These results have important consequences not only for the photoemission experiments of the undoped quasi-2D iridates but also suggest that the physics of the electron- and hole-doped iridates is fundamentally different.