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

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Avella A., Mancini F., Scelza G., Chaturvedi S.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 1
417-420
EN
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 pictures, presents a jump at the same critical line in conformity with the suggested relation between criticality and entanglement.
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