Orbital Mott transition in two dimensional Pyrochlore lattice

Abstract

We study orbital Mott transition in two dimensional pyrochlore lattice, using a two orbital Hubbard model with only inter-orbital electronic hopping. We use a real space Monte Carlo based approach to study the model at finite temperature, and establish temperature-interaction phase diagrams that highlight the Mott transition, orbital ordering, and spectral trends, and possible window of pseudo gap. Due to only inter-orbital hopping, the Mott insulator `generates' ferro exchange resulting in ferro-orbital ordering, with T${}_{corr}/t$ peaked at $\approx$ 0.2 around $U/t\approx 6$. The optical conductivity shows unusual two peak feature due to two dimensional pyrochlore lattice.

7 pages, 4 figures. This is final revised version

References in corpus (7)

• Cluster Dynamical Mean Field Theory of the Mott Transition
• Orbital-Selective Mott transition out of band degeneracy lifting
• Orbital physics in transition metal compounds: new trends
• U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
• Phase competition in the double-exchange model on the frustrated pyrochlore lattice
• Metal-insulator transitions, superconductivity, and magnetism in the two-band Hubbard model
• Correlation-driven Lifshitz transition and orbital order in a two-band Hubbard model