Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

TT 25.5: Vortrag

Dienstag, 21. März 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.