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

• Authors: A. Avella , F. Mancini , G. Scelza , S. Chaturvedi
• Languages of publication: EN

Abstracts

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.

Keywords

EN

71.10.-w; 71.10.Fd; 71.27.+a

Discipline

• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 71.10.-w: Theories and models of many-electron systems
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 417-420

Dates

published

2008-01

received

2007-07-09

Contributors

author

A. Avella

• Dipartimento di Fisica "E.R. Caianiello" - Unita CNISM di Salerno, Universita degli Studi di Salerno, 84081 Baronissi (SA), Italy

author

F. Mancini

• Dipartimento di Fisica "E.R. Caianiello" - Unita CNISM di Salerno, Universita degli Studi di Salerno, 84081 Baronissi (SA), Italy

author

G. Scelza

• Dipartimento di Fisica "E.R. Caianiello" - Unita CNISM di Salerno, Universita degli Studi di Salerno, 84081 Baronissi (SA), Italy

author

S. Chaturvedi

• School of Physics, University of Hyderabad, Hyderabad 500 134, India

References

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• 4. A. Avella, F. Mancini, S. Odashina, G. Scelza, Physica C 460-462 , 1068 (2007)
• 5. F. Mancini, A. Avella, Adv. Phys. 53, 537 (2004)
• 6. K. Eckert, J. Schliemann, D. Bruss, M. Lewenstein, Ann. Phys. 299, 88 (2002)
• 7. P. Zanardi, Phys. Rev. A 65, 042101 (2002)

Identifiers

DOI

10.12693/APhysPolA.113.417