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Limiting cases

To facilitate the discussion of results of exactly solvable models, it is instructive to consider weak- and strong-pairing limits of (13). To this end, we introduce the explicit single-particle Hamiltonian

\hat{H}_0 = \hat H_{\mbox{\rm\scriptsize {sp}}}=\sum_{k=1}^\...
...eft(a^\dagger_k a_k +
a_{\bar{k}}^\dagger a_{\bar{k}} \right)
\end{displaymath} (17)

where ek are the single-particle energies defined in Sec. 2.


Jacek Dobaczewski