Emergent Collective Modes and Kinks in Electronic Dispersions

Abstract

Recently, it was shown that strongly correlated metallic fermionic systems [Nature Phys. 3, 168 (2007)] generically display kinks in the dispersion of single fermions without the coupling to collective modes. Here we provide compelling evidence that the physical origin of these kinks are emerging internal collective modes of the fermionic systems. In the Hubbard model under study these modes are identified to be spin fluctuations which are the precursors of the spin excitations in the insulating phase. In spite of their damping the emergent modes give rise to signatures very similar to features of models including coupling to external modes.

4 pages, 4 figures

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• Poor Man's Understanding of Kinks Originating from Strong Electronic Correlations
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• Fine structure of spectra in the antiferromagnetic phase of the Kondo lattice model
• Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations
• Energy-scale cascade and correspondence between Mott and Kondo lattice physics
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Computing local multipoint correlators using the numerical renormalization group