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

Abstract

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.

13 pages, 15 figures

References in corpus (20)

• The density-matrix renormalization group in the age of matrix product states
• Continuous-time Monte Carlo methods for quantum impurity models
• The numerical renormalization group method for quantum impurity systems
• Real-time dynamics in Quantum Impurity Systems: A Time-dependent Numerical Renormalization Group Approach
• Sum-rule Conserving Spectral Functions from the Numerical Renormalization Group
• Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
• A Numerical Renormalization Group approach to Green's Functions for Quantum Impurity Models
• Spin Precession and Real Time Dynamics in the Kondo Model: A Time-Dependent Numerical Renormalization-Group Study
• Kinks in the dispersion of strongly correlated electrons
• "Waterfalls" in cuprates
• "Waterfalls" phenomenon in superconducting cuprates
• Electron spectra close to a metal-to-insulator transition
• Density-matrix renormalisation group approach to quantum impurity problems
• Manifestation of the magnetic resonance mode in the nodal quasiparticle lifetime in superconducting cuprates
• Spectral Densities from Dynamic Density-Matrix Renormalization
• Emergent Collective Modes and Kinks in Electronic Dispersions
• Conserving approximations in direct perturbation theory: new semianalytical impurity solvers and their application to general lattice problems
• Mott transition in the Hubbard model away from particle-hole symmetry
• Generic susceptibilities of the half-filled Hubbard model in infinite dimensions
• Low-energy kink in the nodal dispersion of copper-oxide superconductors: Insights from Dynamical Mean Field Theory

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• Spectral properties of the two-impurity Anderson model with varying distance and various interactions
• Itinerant and local-moment magnetism in strongly correlated electron systems
• Zero temperature dynamics of the Hubbard model in infinite dimensions: A local moment approach
• Fine structure of spectra in the antiferromagnetic phase of the Kondo lattice model
• Strong spin dependence of correlation effects in Ni due to Stoner excitations
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