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Article
Open AccessFlavour-selective localization in interacting lattice fermions
A large repulsion between particles in a quantum system can lead to their localization, an effect responsible for the Mott insulator phases in strongly correlated materials. In a system with multiple orbitals,...
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Article
Mottness at finite do** and charge instabilities in cuprates
The influence of Mott physics on the do**–temperature phase diagram of copper oxides represents a major issue that is the subject of intense theoretical and experimental efforts. Here, we investigate the ult...
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Article
Snapshots of the retarded interaction of charge carriers with ultrafast fluctuations in cuprates
One of the pivotal questions in the physics of high-temperature superconductors is whether the low-energy dynamics of the charge carriers is mediated by bosons with a characteristic timescale. This issue has r...
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Article
Phonon softening and dispersion in the 1D Holstein model of spinless fermions
We investigate the effect of electron-phonon interaction on the phononic properties in the one-dimensional half-filled Holstein model of spinless fermions. By means of determinantal Quantum Monte Carlo simula...
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Article
Stabilization of A-type layered antiferromagnetic phase in LaMnO3 by cooperative Jahn-Teller deformations
It is shown that the layered antiferromagnetic order in stoechiometric LaMn03 cannot be understood purely from electronic interactions. On the contrary, it mainly results from strong cooperative Jahn-Teller defor...
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Article
Small polaron formation in many-particle states of the Hubbard-Holstein model: The one-dimensional case
We investigate polaron formation in a many-electron system in the presence of a local repulsion sufficiently strong to prevent local-bipolaron formation. Specifically, we consider a Hubbard-Holstein model of i...
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Article
Small Polaron Formation in Strongly Correlated Electronic Systems
We study the crossover to small polarons in the Holstein model for finitedensities in presence of strong electronic correlations. The small polaronformation condition λ>1, which holds for a single particle in ...