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Article
Spectral properties of the 2D Holstein polaron
The two-dimensional Holstein model is studied by means of direct Lanczos diagonalization preserving the full dynamics and quantum nature of phonons. We present numerical exact results for the single-particle s...
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Article
Electron correlations and quantum lattice vibrations in strongly coupled electron-phonon systems: A variational slave boson approach
We investigate the ground-state properties of the two-dimensional Hubbard model with an additional Holstein-type electron-phonon coupling on a square lattice. The effects of quantum lattice vibrations on the s...
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Article
Dynamic spin and charge susceptibilities in thet−J model
Based on the spin-rotation-invariant formulation of the Kotliar Ruckenstein slave-boson representation, the paramagnetic spin and charge susceptibilities in thet-J model are calculated. Analyzing the static spin ...
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Article
Polaron formation and hop** conductivity in the Holstein-Hubbard model
On the basis of the Holstein-Hubbard model the formation of polarons at finite densities is investigated by means of a variational approach appropriate for describing squeezing and correlation effects. An effe...
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Article
Slave-boson phase diagram of the two-dimensional extended Hubbard model: Influence of electron-phonon coupling
We present a detailed study of the extended Hubbard-Peierls model on a square lattice using the slave-boson method proposed by Kotliar and Ruckenstein. The emphasis is on the investigation of the ground state ...
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Article
Slave boson mean field theory for the 2-D Peierls-Hubbard system
Adapting the Kotliar-Ruckenstein slave boson approach to the Hubbard model with an additional local electronphonon interaction, we have studied the stability of the ground state against (π, π) and (π, 0) Peier...