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Carrasco, José A. and Finkel Morgenstern, Federico and González López, Artemio and Rodríguez González, Miguel Ángel and Tempesta, Piergiulio
(2016)
*Generalized isotropic Lipkin-Meshkov-Glick models: ground state entanglement and quantum entropies.*
Journal of statistical mechanics : theory and experiment
.
ISSN 1742-5468

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Official URL: http://dx.doi.org/10.1088/1742-5468/2016/03/033114

## Abstract

We introduce a new class of generalized isotropic Lipkin–Meshkov–Glick models with su(m+1) spin and long-range non-constant interactions, whose non-degenerate ground state is a Dicke state of su(m+1) type. We evaluate in closed form the reduced density matrix of a block of Lspins when the whole system is in its ground state, and study the corresponding von Neumann and Rényi entanglement entropies in the thermodynamic limit. We show that both of these entropies scale as a log L when L tends to infinity, where the coefficient a is equal to (m − k)/2 in the ground state phase with k vanishing magnon densities. In particular, our results show that none of these generalized Lipkin–Meshkov–Glick models are critical, since when L-->∞ their Rényi entropy R_q becomes independent of the parameter q. We have also computed the Tsallis entanglement entropy of the ground state of these generalized su(m+1) Lipkin–Meshkov–Glick models, finding that it can be made extensive by an appropriate choice of its parameter only when m-k≥3. Finally, in the su(3) case we construct in detail the phase diagram of the ground state in parameter space, showing that it is determined in a simple way by the weights of the fundamental representation of su(3). This is also true in the su(m+1) case; for instance, we prove that the region for which all the magnon densities are non-vanishing is an (m + 1)-simplex in R^m whose vertices are the weights of the fundamental representation of su(m+1).

Item Type: | Article |
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Additional Information: | © 2016 IOP Publishing Ltd and SISSA Medialab srl. |

Uncontrolled Keywords: | Body approximation methods; Conformal field-theory; Infinitely coordinated systems; Spin chain; Solvable model; Critical-behavior; Yangian symmetry; Black-holes; Validity; Thermodynamics |

Subjects: | Sciences > Physics > Physics-Mathematical models |

ID Code: | 38428 |

Deposited On: | 05 Jul 2016 15:28 |

Last Modified: | 10 Dec 2018 15:09 |

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