Publication

Strong electron-electron and electron-phonon interactions in one- and two-dimensional solids

Helmuth Berger, Marco Grioni, Luca Perfetti
2004
Journal Articles

Abstract

We discuss the spectral signatures of strong electronic correlations and electron-phonon interactions in two representative low-dimensional systems. In the 2D compound 1T-TaSe2 a charge-density-wave (CDW) induces a narrowing of the conduction band, which triggers a surface metal-insulator (M-I) transition and the disappearance of the quasiparticle (QP) features. In the 1D blue bronze K0.3MoO3 strong interaction with the lattice lead to pseudogapped polaronic lineshapes, and the large mass renormalization masks the signatures of electronic correlations. (C) 2004 Elsevier B.V All rights reserved.

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https://infoscience.epfl.ch/entities/publication/38d2bfc4-fdf5-44e2-8f83-51a452d3faff

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Helmuth Berger, Marco Grioni, Luca Perfetti
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/38d2bfc4-fdf5-44e2-8f83-51a452d3faff

About this result

Related concepts (32)

Electronic correlation

Electronic correlation is the interaction between electrons in the electronic structure of a quantum system. The correlation energy is a measure of how much the movement of one electron is influenced by the presence of all other electrons. Within the Hartree–Fock method of quantum chemistry, the antisymmetric wave function is approximated by a single Slater determinant. Exact wave functions, however, cannot generally be expressed as single determinants.

Valence and conduction bands

In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states. On a graph of the electronic band structure of a semiconducting material, the valence band is located below the Fermi level, while the conduction band is located above it.

Dynamical mean-field theory

Dynamical mean-field theory (DMFT) is a method to determine the electronic structure of strongly correlated materials. In such materials, the approximation of independent electrons, which is used in density functional theory and usual band structure calculations, breaks down. Dynamical mean-field theory, a non-perturbative treatment of local interactions between electrons, bridges the gap between the nearly free electron gas limit and the atomic limit of condensed-matter physics.

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Strong electron-electron and electron-phonon interactions in one- and two-dimensional solids

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