Renormalization of Bulk Magnetic Electron States at High Binding Energies

Hofmann, Andreas; Cui, X. Y.; Schäfer, J.; Meyer, S.; Höpfner, P.; Blumenstein, C.; Paul, Markus; Patthey, L.; Rotenberg, Eli; Bünemann, Jörg; Gebhard, Florian; Ohm, T.; Weber, W. H.; Claessen, R.

doi:10.1103/physrevlett.102.187204

Cited by 49 publications

(55 citation statements)

References 31 publications

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“…Of course, additional kinks in the electronic dispersion may also arise from the coupling of electrons to bosonic degrees of freedom, such as phonons or spin fluctuations. Interestingly, recent experiments [183] have found evidence for kinks in Ni (110), which may be due to the electronic mechanism presented here.…”

Section: Kinks In the Dispersion Of Strongly Correlated Electron Systemssupporting

confidence: 49%

Dynamical Mean-Field Theory of Electronic Correlations in Models and Materials

Vollhardt

Avella²,

Mancini³

2010

AIP Conference Proceedings

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Abstract. The concept of electronic correlations plays an important role in modern condensed matter physics. It refers to interaction effects which cannot be explained within a static meanfield picture as provided by Hartree-Fock theory. Electronic correlations can have a very strong influence on the properties of materials. For example, they may turn a metal into an insulator (Mott-Hubbard metal-insulator transition). In these lecture notes I (i) introduce basic notions of the physics of correlated electronic systems, (ii) discuss the construction of mean-field theories by taking the limit of high lattice dimensions, (iii) explain the simplifications of the many-body perturbation theory in this limit which provide the basis for the formulation of a comprehensive mean-field theory for correlated fermions, the dynamical mean-field theory (DMFT), (v) derive the DMFT self-consistency equations, and (vi) apply the DMFT to investigate electronic correlations in models and materials.

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Section: Kinks In the Dispersion Of Strongly Correlated Electron Systemssupporting

confidence: 49%

Dynamical Mean-Field Theory of Electronic Correlations in Models and Materials

Vollhardt

Avella²,

Mancini³

2010

AIP Conference Proceedings

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“…Of course, additional kinks in the electronic dispersion may also arise from the coupling of electrons to bosonic degrees of freedom, such as phonons [71,72] or spin fluctuations [73,74]. Interestingly, recent experiments [75] have found evidence for kinks in Ni (110), which may be due to the electronic mechanism discussed here.…”

Section: Dmft and The Three-peak Structure Of The Spectral Functionmentioning

confidence: 90%

Dynamical Mean-Field Theory

Vollhardt

Byczuk

Kollar

2011

Springer Series in Solid-State Sciences

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Abstract. The dynamical mean-field theory (DMFT) is a widely applicable approximation scheme for the investigation of correlated quantum many-particle systems on a lattice, e.g., electrons in solids and cold atoms in optical lattices. In particular, the combination of the DMFT with conventional methods for the calculation of electronic band structures has led to a powerful numerical approach which allows one to explore the properties of correlated materials. In this introductory article we discuss the foundations of the DMFT, derive the underlying self-consistency equations, and present several applications which have provided important insights into the properties of correlated matter. Motivation Electronic CorrelationsAlready in 1937, at the outset of modern solid state physics, de Boer and Verwey [1] drew attention to the surprising properties of materials with incompletely filled 3d-bands. This observation prompted Mott and Peierls [2] to discuss the interaction between the electrons. Ever since transition metal oxides (TMOs) were investigated intensively [3]. It is now well-known that in many materials with partially filled electron shells, such as the 3d transition metals V and Ni and their oxides, or 4f rare-earth metals such as Ce, electrons occupy narrow orbitals. The spatial confinement enhances the effect of the Coulomb interaction between the electrons, making them "strongly correlated". Correlation effects can lead to profound quantitative and qualitative changes of the physical properties of electronic systems as compared to non-interacting particles. In particular, they often respond very strongly to changes in external parameters. This is expressed by large renormalizations of the response functions of the system, e.g., of the spin susceptibility and the charge compressibility. In particular, the interplay between the spin, charge and orbital degrees of freedom of the correlated d and f electrons and with the lattice degrees of freedom leads to an amazing multitude of ordering phenomena and other fascinating properties, including high temperature superconductivity, colossal magnetoresistance and Mott metal-insulator transitions [3].arXiv:1109.4833v1 [cond-mat.str-el]

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“…This energy range is quite different from that discussed in recent high-resolution ARPES studies on Fe or Ni. 28,30,71 There, the very low BE range E B 300 meV has been treated, in which a renormalization of the charge carrier dynamics by a coupling to phonon or magnetic excitations is important. All the observed peaks in Figs.…”

Section: Resultsmentioning

confidence: 99%

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Sánchez-Barriga

Braun²,

Minář³

et al. 2012

Phys. Rev. B

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We have investigated the spin-dependent quasiparticle lifetimes and the strength of electron correlation effects in the ferromagnetic 3d transition metals Fe, Co, and Ni by means of spin-and angle-resolved photoemission spectroscopy. The experimental data are accompanied by state-of-the-art many-body calculations within the dynamical mean-field theory and the three-body scattering approximation, including fully relativistic calculations of the photoemission process within the one-step model. Our quantitative analysis reveals that inclusion of local many-body Coulomb interactions are of ultimate importance for a realistic description of correlation effects in ferromagnetic 3d transition metals. However, we found that more sophisticated many-body calculations with larger modifications in the case of Fe and Co are still needed to improve the quantitative agreement between experiment and theory. In general, it turned out that not only the dispersion behavior of energetic structures should be affected by nonlocal correlations but also the line widths of most of the photoemission peaks are underestimated by the current theoretical approaches. The increasing values of the on-site Coulomb interaction parameter U and the band narrowing of majority spin states obtained when moving from Fe to Ni indicate that the effect of nonlocal correlations becomes weaker with increasing atomic number, whereas correlation effects tend to be stronger.

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Renormalization of Bulk Magnetic Electron States at High Binding Energies

Cited by 49 publications

References 31 publications

Dynamical Mean-Field Theory of Electronic Correlations in Models and Materials

Dynamical Mean-Field Theory of Electronic Correlations in Models and Materials

Dynamical Mean-Field Theory

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

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