Entanglement Properties and Phase Diagram of the Two-Orbital Atomic Hubbard Model

Details Entanglement Properties and Phase Diagram of the Two-Orbital Atomic Hubbard Model Entanglement Properties and Phase Diagram of the Two-Orbital Atomic Hubbard Model

2009-06-12

arxiv.org/abs/0906.2370v1

acta physica polonica A, 417, vol. 113 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure

Scientific paper

We study the two-orbital Hubbard model in the limit of vanishing kinetic energy. The phase diagram in the $V-J$ plane, with $V$ and $J$ denoting the interorbital hybridization and exchange coupling respectively, at half filling is obtained. A singlet(dimer)-triplet transition is found for a critical value of the ratio $V/J.$ The entropy of formation, both in the mode and in the particle picture, presents a jump as the same critical line in conformity with the suggested relation between criticality and entanglement.

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