Kinks in the dispersion of strongly correlated electrons

Abstract

The properties of condensed matter are determined by single-particle and collective excitations and their interactions. These quantum-mechanical excitations are characterized by an energy E and a momentum \hbar k which are related through their dispersion E_k. The coupling of two excitations may lead to abrupt changes (kinks) in the slope of the dispersion. Such kinks thus carry important information about interactions in a many-body system. For example, kinks detected at 40-70 meV below the Fermi level in the electronic dispersion of high-temperature superconductors are taken as evidence for phonon or spin-fluctuation based pairing mechanisms. Kinks in the electronic dispersion at binding energies ranging from 30 to 800 meV are also found in various other metals posing questions about their origins. Here we report a novel, purely electronic mechanism yielding kinks in the electron dispersions. It applies to strongly correlated metals whose spectral function shows well separated Hubbard subbands and central peak as, for example, in transition metal-oxides. The position of the kinks and the energy range of validity of Fermi-liquid (FL) theory is determined solely by the FL renormalization factor and the bare, uncorrelated band structure. Angle-resolved photoemission spectroscopy (ARPES) experiments at binding energies outside the FL regime can thus provide new, previously unexpected information about strongly correlated electronic systems.

8 pages, 5 figures

References in corpus (5)

• A universal high energy anomaly in angle resolved photoemission spectra of high temperature superconductors - possible evidence of spinon and holon branches
• Fermi surface evolution and Luttinger theorem in Na${}_x$CoO${}_2$: a systematic photoemission study
• The hierarchy of multiple many-body interaction scales in high-temperature superconductors
• Momentum-resolved spectral functions of SrVO${}_3$ calculated by LDA+DMFT
• Universal quasiparticle decoherence in hole- and electron-doped high-Tc cuprates

Cited by in corpus (55)

• Ab initio GW many-body effects in graphene
• The coherence-incoherence crossover and the mass-renormalization puzzles in Sr2RuO4
• How bad metals turn good: spectroscopic signatures of resilient quasiparticles
• Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials
• A Systematic Study of Electron-Phonon Coupling to Oxygen Modes Across the Cuprates
• Doped high-Tc cuprate superconductors elucidated in the light of zeros and poles of electronic Green's function
• Combined GW and dynamical mean field theory: Dynamical screening effects in transition metal oxides
• Fermi surfaces, electron-hole asymmetry and correlation kink in a three-dimensional Fermi liquid LaNiO${}_3$
• High energy kink in the single particle spectra of the two-dimensional Hubbard model
• Ab initio dynamical vertex approximation
• High-energy magnetic excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$: Towards a unified description of the electronic and magnetic degrees of freedom in the cuprates
• Normal State Correlated Electronic Structure of Iron Pnictides
• Quasiparticles at the verge of localization near the Mott metal-insulator transition in a two-dimensional material
• High Energy Dispersions in Bi2Sr2CaCu2O8 High Temperature Superconductor from Laser-Based Angle-Resolved Photoemission
• Effect of strong correlations on the high energy anomaly in hole- and electron-doped high-Tc superconductors
• Dynamical vertex approximation for nanoscopic systems
• The doping-driven evolution of the superconducting state of a doped Mott insulator: a key for the high temperature superconductivity
• Temperature and doping dependence of high-energy kink in cuprates
• Unmasking the Origin of Kinks in the Photoemission Spectra of Cuprate Superconductors
• Emergent Collective Modes and Kinks in Electronic Dispersions
• Excitation energy map of the high-energy dispersion anomalies in cuprates
• Electronic structure of kinetic energy driven cuprate superconductors
• On the separability of dynamical and non-local correlations in three dimensions
• Bandstructure meets many-body theory: The LDA+DMFT method
• Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212
• Kinks in the electronic specific heat
• Extracting the spectral function of the cuprates by a full two-dimensional analysis: Angle-resolved photoemission spectra of Bi2Sr2CuO6
• Extremely Correlated Fermi Liquid Description of Normal State ARPES in Cuprates
• Non-Fermi liquid signatures in the Hubbard Model due to van Hove singularities
• Universal properties of high-temperature superconductors from real-space pairing III: The role of correlated hopping and intersite Coulomb interaction within the t-J-U model
• Quantum Oscillations from Fermi Sea
• Emergence of a common energy scale close to the orbital-selective Mott transition
• Dipole matrix element approach vs. Peierls approximation for optical conductivity
• Two-mode variational Monte Carlo study of Quasiparticle excitations in cuprates
• Generic susceptibilities of the half-filled Hubbard model in infinite dimensions
• Interplay of electron-phonon interaction and strong correlations: DMFT+Σstudy
• Ubiquitous Coexisting Electron-Mode Couplings in High Temperature Cuprate Superconductors
• Charge-Density-Wave Order in 2H-NbSe${}_2$
• Enhanced electron correlations at the SrxCa1-xVO3 surface
• Dichotomy in Low- and High-energy Band Renormalizations in Trilayer Nickelate $L{a}_{4}N{i}_3{O}_{10}$: a Comparison with Cuprates
• Electronic structure of the highly conductive perovskite oxide SrMoO${}_3$
• Incoherent mid-infrared charge excitation and the high energy anomaly in the photoemission spectra of cuprates
• Doping-dependent bandwidth renormalization and spin-orbit coupling in (Sr${}_{1-x}$La${}_x$)${}_2$RhO${}_4$
• Kinks in the periodic Anderson model
• Fine structure of spectra in the antiferromagnetic phase of the Kondo lattice model
• Interplay of electron-phonon interaction and strong correlations: DMFT+Sigma approach
• Systematic tight-binding analysis of ARPES spectra of transition-metal oxides
• Strong Momentum-Dependent Electron-Magnon Renormalization of a Surface Resonance on Iron
• A negative-U interpretation of the femto-second laser pulse induced crystallographic expansion of a cuprate HTSC material reported recently by Gedik et al
• Clean realization of the Hund physics near the Mott transition: $\mathrm{Ni}{\mathrm{S}}_2$ under pressure
• Electron-phonon coupling in a two-dimensional inhomogeneous electron gas: consequences for surface spectral properties
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Mott metal-insulator transition in a modified periodic Anderson model: Insights from entanglement entropy and role of short-range spatial correlations
• Origin of misleading convergence in self-consistent many-electron theories: Fundamental aspects and practical implications
• Energy-dependent scaling of incoherent spectral weight and the origin of the waterfalls in high-Tc cuprates