Ground-state properties of the BCS–Bose Einstein crossover in a dx2−y2-wave superconductor
B. C. den Hertog
DOI 10.1103/PhysRevB.60.559 · Physical Review B
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Abstract
We examine the ground-state properties of the crossover between BCS superconductivity and Bose Einstein condensation within a model that exhibits dx2−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 ground state 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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