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

Abstract

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.

5 pages, 1 figure

References in corpus (3)

• Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
• The Hubbard model within the equations of motion approach
• Dynamical behavior across the Mott transition of two bands with different bandwidths

Cited by in corpus (4)

• Emery vs. Hubbard model for cuprate superconductors: a Composite Operator Method study
• Composite Operator Method analysis of the underdoped cuprates puzzle
• Exact solution of the 1D Hubbard model in the atomic limit with inter-site magnetic coupling
• The composite operator method route to the 2D Hubbard model and the cuprates