Emergence of a common energy scale close to the orbital-selective Mott transition

Abstract

We calculate the spectra and spin susceptibilities of a Hubbard model with two bands having different bandwidths but the same on-site interaction, with parameters close to the orbital-selective Mott transition, using dynamical mean-field theory. If the Hund's rule coupling is sufficiently strong, one common energy scale emerges which characterizes both the location of kinks in the self-energy and extrema of the diagonal spin susceptibilities. A physical explanation of this energy scale is derived from a Kondo-type model. We infer that for multi-band systems local spin dynamics rather than spectral functions determine the location of kinks in the effective band structure.

5 pages, 5 figures

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• Non-local correlations in the orbital selective Mott phase of a one dimensional multi-orbital Hubbard model
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• Improved estimator for numerical renormalization group calculations of the self-energy
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