Potential-energy (BCS) to kinetic-energy (BEC)-driven pairing in the attractive Hubbard model

Abstract

The BCS-BEC crossover within the two-dimensional attractive Hubbard model is studied by using the Cellular Dynamical Mean-Field Theory both in the normal and superconducting ground states. Short-range spatial correlations incorporated in this theory remove the normal-state quasiparticle peak and the first-order transition found in the Dynamical Mean-Field Theory, rendering the normal state crossover smooth. For $U$ smaller than the bandwidth, pairing is driven by the potential energy, while in the opposite case it is driven by the kinetic energy, resembling a recent optical conductivity experiment in cuprates. Phase coherence leads to the appearance of a collective Bogoliubov mode in the density-density correlation function and to the sharpening of the spectral function.

5 pages, 4 figures

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Cited by in corpus (24)

• Pseudogap and high-temperature superconductivity from weak to strong coupling. Towards quantitative theory
• Signatures of the Mott transition in the antiferromagnetic state of the two-dimensional Hubbard model
• Dynamical mean-field theory and numerical renormalization group study of superconductivity in the attractive Hubbard model
• Signature of antiferromagnetic long-range order in the optical spectrum of strongly correlated electron systems
• Optical Conductivity of the t-J model within Cluster Dynamical Mean Field Theory
• Local origin of the pseudogap in the attractive Hubbard model
• Electromotive forces and the Meissner effect puzzle
• Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices
• Polarized superfluidity in the attractive Hubbard model with population imbalance
• Kinetic energy driven superconductivity, the origin of the Meissner effect, and the reductionist frontier
• Quasiparticle excitations and dynamic susceptibilities in the BCS-BEC crossover
• Hidden fermionic excitation in the superconductivity of the strongly attractive Hubbard model
• Intraband Optical Spectral Weight in the presence of a van Hove singularity: application to Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Kinetic energy driven superconductivity and superfluidity
• Optical Integral and Sum Rule Violation
• Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in Optical Lattices: A Dynamical Mean-Field-Theory Study
• BCS-BEC Crossover in the Two-Dimensional Attractive Hubbard Model: Variational Cluster Approach
• Interface and bulk superconductivity in superconducting heterostructures with enhanced critical temperatures
• Variational Monte Carlo Study of Spin-Gapped Normal State and BCS-BEC Crossover in Two-Dimensional Attractive Hubbard Model
• Evolution of pairing from weak to strong coupling on a honeycomb lattice
• Optical conductivity for a dimer in the Dynamic Hubbard model
• Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices
• Superconductor-Insulator transition in a two-orbital attractive Hubbard model with Hund's exchange
• Local-moment magnetism in Mn-based pnictides