Spin-orbital entanglement near quantum phase transitions

Oleś, A. M.; Horsch, P.; Khaliullin, G.

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Spin-orbital entanglement near quantum phase transitions

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Oleś, A. M.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Horsch, P.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin, G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Oleś, A. M., Horsch, P., & Khaliullin, G. (2007). Spin-orbital entanglement near quantum phase transitions. physica status solidi (b), 244(7), 2378-2383.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B659-1

Abstract

Spin-orbital entanglement in the ground state of a one-dimensional SU(2) x 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. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.