Entanglement in a spin system with inverse square statistical interaction

Details Entanglement in a spin system with inverse square statistical interaction Entanglement in a spin system with inverse square statistical interaction

2009-10-07

arxiv.org/abs/0910.1227v2

New J. Phys. 12 (2010) 025021

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 7 eps figures. Submitted to New. J. Phys, special issue "Quantum Information and Many-Body Theory"(co-edited by J Ei

Scientific paper

We investigate the entanglement content of the ground state of a system characterized by effective elementary degrees of freedom with fractional statistics. To this end, we explicitly construct the ground state for a chain of $N$ spins with inverse square interaction (the Haldane-Shastry model) in the presence of an external uniform magnetic field. For such a system at zero temperature, we evaluate the entanglement in the ground state both at finite size and in the thermodynamic limit. We relate the behavior of the quantum correlations with the spinon condensation phenomenon occurring at the saturation field.

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