Kinks in the electronic dispersion of the Hubbard model away from half filling

Details Kinks in the electronic dispersion of the Hubbard model away from half filling Kinks in the electronic dispersion of the Hubbard model away from half filling

2011-07-07

arxiv.org/abs/1107.1370v2

Physical Review B 84(20), 205104 (2011); URL: http://link.aps.org/doi/10.1103/PhysRevB.84.205104

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 15 figures

Scientific paper

10.1103/PhysRevB.84.205104

We study kinks in the electronic dispersion of a generic strongly correlated system by dynamic mean-field theory (DMFT). The focus is on doped systems away from particle-hole symmetry where valence fluctuations matter potentially. Three different algorithms are compared to asses their strengths and weaknesses, as well as to clearly distinguish physical features from algorithmic artifacts. Our findings extend a view previously established for half-filled systems where kinks reflect the coupling of the fermionic quasiparticles to emergent collective modes, which are identified here as spin fluctuations. Kinks are observed when strong spin fluctuations are present and, additionally, a separation of energy scales for spin and charge excitations exists. Both criteria are met by strongly correlated systems close to a Mott-insulator transition. The energies of the kinks and their doping dependence fit well to the kinks in the cuprates, which is surprising in view of the spatial correlations neglected by DMFT.

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