Coexistence of superconductivity and charge-density waves in a two-dimensional Holstein model at half-filling

Abstract

In one dimension the coupling of electrons to phonons leads to a transition from a metallic to a Peierls distorted insulated state if the coupling exceeds a critical value. On the other hand, in two dimensions the electron-phonon interaction may also lead to the formation of Cooper pairs. This competition of superconductivity and charge order (in conjunction with a lattice distortion) is studied in this letter by means of the projector-based renormalization method (PRM). Increasing the electron-phonon interaction, we find a crossover behavior between a purely superconducting state and a charge-density wave where a well-defined parameter range of coexistence of superconductivity and lattice distortion exists.

11 pages, 2 figures

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Cited by in corpus (16)

• Spectral signatures of the BCS-BEC crossover in the excitonic insulator phase of the extended Falicov-Kimball model
• Superconductivity and charge density wave order in the 2D Holstein model
• Isotope effect and bond-stretching phonon anomaly in high-Tc cuprates
• Phonon anomalies and dynamic stripes
• Excitonic resonances in the 2D extended Falicov-Kimball model
• Giant electron-phonon anomaly in doped La2CuO4 and other cuprates
• Exciton condensation due to electron-phonon interaction
• Optical response of laser-driven charge-transfer complex described by Holstein-Hubbard model coupled to heat baths: Hierarchical equations of motion approach
• Generalized diagonalization scheme for many-particle systems
• Charge-density-wave formation in a half-filled fermion-boson transport model: A projective renormalization approach
• Impact ionization dynamics in small band-gap 2D materials from a coherent phonon mechanism
• Optimal Boson energy for superconductivity in the Holstein model
• Supersolid Phase in the Diluted Holstein Model
• Linear response within the projection-based renormalization method: Many-body corrections beyond the random phase approximation
• Optical amplification in a CDW-phase of a quasi-two dimensional material
• Commensurate to Incommensurate Transition of Three Dimensional Charge Density Waves