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

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          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.

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          Author and article information

          Journal
          26 August 2005
          2006-07-11
          Article
          10.1103/PhysRevB.74.024501
          cond-mat/0508645
          4933d0d4-82e7-44fe-be2b-2ca91992bc2b
          History
          Custom metadata
          Phys. Rev. B 74, 024501 (2006)
          5 pages, 4 figures
          cond-mat.str-el cond-mat.supr-con

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