Spin-orbital entanglement near quantum phase transitions

Abstract

Spin-orbital entanglement in the ground state of a one-dimensional SU(2)$\otimes$SU(2) spin-orbital model is analyzed using exact diagonalization of finite chains. For $S=1/2$ spins and $T=1/2$ pseudospins one finds that the quantum entanglement is similar at the SU(4) symmetry point and in the spin-orbital valence bond state. We also show that quantum transitions in spin-orbital models turn out to be continuous under certain circumstances, in constrast to the discontinuous transitions in spin models with SU(2) symmetry.

5 pages, 4 figures

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Cited by in corpus (6)

• Fingerprints of spin-orbital entanglement in transition metal oxides
• Exotic spin orders driven by orbital fluctuations in the Kugel-Khomskii model
• Entangled spin-orbital phases in the bilayer Kugel-Khomskii model
• Topological Order in an Entangled SU(2)$\otimes$XY Spin-Orbital Ring
• Charge and orbital order in transition metal oxides
• Exotic Spin Order due to Orbital Fluctuations