EVOLUTION FROM THE BCS TO THE BOSE-EINSTEIN LIMIT IN A d-WAVE SUPERCONDUCTOR AT T=0
L.S. Borkowskia,b and C.A.R. Sa de Melob
aInstitute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
bSchool of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
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Received: January 18, 2001; in final form May 7, 2001
We study the evolution from BCS to Bose limit in a two-dimensional d-wave superconductor at zero temperature and low density of charge carriers within the mean-field theory. We examine single quasiparticle properties when particle density and attraction strength are varied. For sufficiently high interaction strength there is a critical density below which the system has a gap. The spectral and thermodynamic properties of the system do not evolve smoothly from the BCS-like to the Bose-like regime.
DOI: 10.12693/APhysPolA.99.691
PACS numbers: 74.20.-z, 74.25.Gz, 67.40.Db