Entanglement Properties and Phase Diagram of the Two-Orbital Atomic Hubbard Model |
| A. Avella, F. Mancini, G. Scelza
Dipartimento di Fisica "E.R. Caianiello" - Unità CNISM di Salerno, Università degli Studi di Salerno, 84081 Baronissi (SA), Italy and S. Chaturvedi School of Physics, University of Hyderabad, Hyderabad 500 134, India |
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| Received: 9 07 2007; |
| 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. |
| DOI: 10.12693/APhysPolA.113.417 PACS numbers: 71.10.-w, 71.10.Fd, 71.27.+a |