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• W3104259711 abstract "Using the exact diagonalization technique, we determine the energy spectrum and wave functions for finite chains described by the two-spin (Kugel--Khomskii) model with different types of intersubsystem exchange terms. The found solutions provide a possibility to address the problem of quantum entanglement inherent to this class of models. We put the main emphasis on the calculations of the concurrence treated as an adequate numerical measure of the entanglement. We also analyze the behavior of two-site correlation functions considered as a local indicator of entanglement. We construct the phase diagrams of the models involving the regions of nonzero entanglement. The pronounced effect of external fields, conjugated to both spin variables on the regions with entanglement, could both enhance and weaken the entanglement depending on the parameters of the models." @default.
• W3104259711 created "2020-11-23" @default.
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• W3104259711 date "2020-10-19" @default.
• W3104259711 modified "2023-10-16" @default.
• W3104259711 title "Quantum entanglement, local indicators, and the effect of external fields in the Kugel-Khomskii model" @default.
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• W3104259711 doi "https://doi.org/10.1103/physrevb.102.155125" @default.
• W3104259711 hasPublicationYear "2020" @default.
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