Pseudogaps in Strongly Correlated Metals: Optical Conductivity within the Generalized Dynamical Mean-Field Theory Approach

Abstract

Optical conductivity of the weakly doped two-dimensional repulsive Hubbard model on the square lattice with nearest and next nearest hoppings is calculated within the generalized dynamical-mean field (DMFT+Σ_p) approach which includes correlation length scale ξinto the standard DMFT equations via the momentum dependent self-energy Σ_p, with full account of appropriate vertex corrections. This approach takes into consideration non-local dynamical correlations induced e.g. by short-ranged collective SDW-like antiferromagnetic spin fluctuations, which (at high enough temperatures) can be viewed as a quenched Gaussian random field with finite correlation length ξ. The effective single impurity problem is solved by numerical renormalization group (NRG). We consider both the case of correlated metal with the bandwidth W<=U and that of doped Mott insulator with U>>W (U - value of local Hubbard interaction). Optical conductivity calculated within DMFT+Σ_p demonstrates typical pseudogap behavior within the quasiparticle band in qualitative agreement with experiments in copper oxide superconductors. For large values of U pseudogap anomalies are effectively suppressed.

33 pages, 14 figures, 1 Appendix, as it is accepted in PRB

References in corpus (18)

• The pseudogap in high-temperature superconductors: an experimental survey
• Quantum Cluster Theories
• Cellular Dynamical Mean Field Approach to Strongly Correlated Systems
• Anomalous Normal-State Properties of High-T${}_c$ Superconductors -- Intrinsic Properties of Strongly Correlated Electron Systems?
• Zero temperature metal-insulator transition in the infinite-dimensional Hubbard model
• Numerical Renormalization Group Calculations for the Self-energy of the impurity Anderson model
• Weak Pseudogap Behavior in the Underdoped Cuprate Superconductors
• Kosterlitz-Thouless Transition and Short Range Spatial Correlations in an Extended Hubbard Model
• Pseudogap in High - Temperature Superconductors
• Microscopic theory of weak pseudogap behavior in the underdoped cuprate superconductors I: General theory and quasiparticle properties
• Pseudogaps in Strongly Correlated Metals: A generalized dynamical mean-field theory approach
• Cluster Dynamical Mean-Field Theory of the density-driven Mott transition in the one-dimensional Hubbard model
• "Destruction" of the fermi surface due to pseudogap fluctuations in strongly correlated systems
• Pseudogaps in the t-J model: Extended DMFT study
• Pseudogaps in an Incoherent Metal
• Models of the Pseudogap State of Two-Dimensional Systems
• Density and current response functions in strongly disordered electron systems: Diffusion, electrical conductivity and Einstein relation
• Optical Conductivity in a Two - Dimensional Model of the Pseudogap State

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