Band Kondo Effect in the Doped 2D Hubbard Model
Bumsoo Kyung (Max Planck Institute)
TL;DR
This paper provides numerical evidence for the band Kondo effect in the doped 2D Hubbard model, demonstrating how magnetic moments are screened at low temperatures through changes in electronic properties.
Contribution
It offers the first systematic numerical analysis showing the band Kondo effect in the doped 2D Hubbard model, highlighting the temperature-dependent screening behavior.
Findings
Quadratically vanishing scattering rates near the Fermi energy
Linearly vanishing effective magnetic moment at low temperatures
Systematic changes in density of states and self-energy
Abstract
We present strong numerical evidence for the band Kondo effect in the doped 2D Hubbard model by showing the systematic change of the density of states, imaginary part of the self-energy, effective magnetic moment and quasiparticle residue upon decreasing the temperature. Quadratically vanishing (in frequency) scattering rates near the Fermi energy and a linearly vanishing (in temperature) effective magnetic moment at low temperatures strongly support the screening of magnetic moments from singly occupied electrons by doped holes in the 2D Hubbard model.
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Taxonomy
TopicsQuantum and electron transport phenomena · Physics of Superconductivity and Magnetism · Rare-earth and actinide compounds