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20 November 2017
  » arxiv » cond-mat/0508645

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Potential-energy (BCS) to kinetic-energy (BEC)-driven pairing in the attractive Hubbard model
B. Kyung ; A. Georges ; A. -M. S. Tremblay ;
Rating Members: 3.91/5 (1 reader)
Date 26 Aug 2005
Subject Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con
AbstractThe 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.
Source arXiv, cond-mat/0508645
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1 review found:
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1. review 06040041 (2 readers)    * Rate this comment.
Review title: A recent progress in the understanding of the BCS-BEC crossover
Reviewer: reviewer182
Date: 06 April 2006 at 15:56 GMT.

The authors have a long experience in developing novel methods providing a better understandin of the physics contained in the simple qua [...]

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