Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Frustrated Magnets - General 2 (joint session TT/MA)
TT 33.5: Vortrag
Dienstag, 2. April 2019, 15:00–15:15, Theater
The evolution of spin – orbital entanglement in the approximate SU(2)⊗SU(2) model — •Dorota Gotfryd1,2, Ekaterina Paerschke3, Andrzej M. Oles2,4, and Krzysztof Wohlfeld1 — 1Institute of Theoretical Physics, University of Warsaw, Warsaw, Poland — 2Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland — 3Department of Physics, University of Alabama at Birmingham, Birmingham, USA — 4Max Planck Institute for Solid State Research, Stuttgart, Germany
In insulating states of transition metal oxides with orbital degeneracy spin – orbital superexchange describes the effective interactions [1]. In such a frustrated environment the quasi – empirical Goodenough – Kanamori rules may be violated leading to inter – site spin – orbital entanglement [2]. In this talk we analyse the phase diagram of an SU(2)⊗SU(2) symmetric model [3, 4] perturbed with a less symmetric term. Even though such conditions create more complicated type of entanglement, interestingly the underlying physics becomes much simpler. We present extensive numerical studies supported also by analytical calculations.
This work is supported by Narodowe Centrum Nauki (NCN, Poland)
under Projects No. 2016/23/B/ST3/00839 and No. 2016/22/E/ST3/00560.
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W.-L. You, P. Horsch, A.M. Oles, Phys. Rev. B 92, 054423 (2015)