We study the connection between the BCS pairing model and the inhomogeneous vertex model. The two spectral problems coincide in the quasiclassical limit of the off-shell Bethe ansatz of the disordered six-vertex model. The latter problem is transformed into an auxiliary spectral problem which corresponds to the diagonalization of the integrals of motion of the BCS model. A generating functional whose quasi-classical expansion leads to the constants of motion of the BCS model, and in particular the Hamiltonian, is identified.
|Titolo:||The BCS model and the off shell Bethe Ansatz of vertex models|
|Autori interni:||FALCI, Giuseppe|
|Data di pubblicazione:||2001|
|Rivista:||JOURNAL OF PHYSICS. A, MATHEMATICAL AND GENERAL|
|Appare nelle tipologie:||1.1 Articolo in rivista|