Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures

2005/05/04 by C. Knecht, N. Blümer, P. G. J. van Dongen
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.72.081103

published as Phys. Rev. B 72, 081103(R) (2005) · 4 pages, 5 figures

arxiv created 2005/05/04 · openalex publication_date 2005/08/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The anisotropic degenerate two-orbital Hubbard model is studied within dynamical mean-field theory at low temperatures. High-precision calculations on the basis of a refined quantum Monte Carlo (QMC) method reveal that two distinct orbital-selective Mott transitions occur for a bandwidth ratio of 2, even in the absence of spin-flip contributions to the Hund exchange. The second transition---not seen in earlier studies using QMC, iterative perturbation theory, and exact diagonalization---is clearly exposed in a low-frequency analysis of the self-energy and in local spectra.

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• Phase Diagrams of the Two-Orbital Hubbard Model with Different Bandwidths
• Critical Behaviour near the Mott Transition in a Two-Band Hubbard Model
• The Orbital Selective Mott Transition in a Three Band Hubbard model: a Slave Boson Mean Field Study
• Magnetic instability of the orbital-selective Mott phase