Groundstate properties of the BCS-Bose Einstein crossover in a d_x²-y² wave superconductor

1998/08/05 by B. C. den Hertog, Hertog, B. C. den
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/9808051

Comments added to text. Scheduled to appear in Phys. Rev. B, Jun 1 1999. RevTex, 5 pages, 4 figures

arxiv created 1999/03/29 · arxiv updated 2009/11/30

Abstract

We examine the groundstate properties of the crossover between BCS superconductivity and Bose Einstein condensation within a model which exhibits d_{x² - y²} pairing symmetry. We compare results for zero temperature with known features of s-wave systems and show that bosonic degrees of freedom are likely to emerge only in the dilute limit. We relate the change in properties of the groundstate as a function of density to the effect of the exclusion principle and show that the one particle distribution function undergoes a significant change when bosonic behavior appears.

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