Entanglement in a first order quantum phase transition

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The phase diagram of spins 1/2 embedded in a magnetic field mutually interacting antiferromagnetically is determined. Contrary to the ferromagnetic case where a second order quantum phase transition occurs, a first order transition is obtained at zero field. The spectrum is computed for a large number of spins and allows one to study the ground state entanglement properties which displays a jump of its concurrence at the critical point.
4 pages, 3 EPS figures

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Strongly Correlated Electrons, Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/99358

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0312130
 http://arxiv.org/abs/cond-mat/0312130
 Phys. Rev. A 69, 054101 (2004)
 doi:10.1103/PhysRevA.69.054101

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arXiv