Large- N limit of the exactly solvable BCS model: analytics versus numerics
Abstract
We have studied the numerical solutions of Richardson equations of the BCS model in the limit of large number of energy levels at half-filling, and compare them with the analytic results derived by Gaudin and Richardson, which in turn leads to the standard BCS solution. We focus on the location and density of the roots, the eigenvalues of the conserved quantities, and the scaling properties of the total energy for the equally spaced and the two-level models.
- Publication:
-
Nuclear Physics B
- Pub Date:
- July 2002
- DOI:
- 10.1016/S0550-3213(02)00317-6
- arXiv:
- arXiv:cond-mat/0202070
- Bibcode:
- 2002NuPhB.634..483R
- Keywords:
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- Condensed Matter - Superconductivity;
- Nuclear Theory
- E-Print:
- Revtex 4 file. 24 pages with 13 figures in text. Minor changes, references added