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- W2037090765 abstract "The problem of vanishing quasiparticle energies in the BCS theory is outlined, and a practical solution is reviewed which not only removes the problem but improves the theory in all cases without requiring a substantial increase in the computation time. This solution also removes a major deficiency of the BCS theory, emphasized by Belyaev. The particle-hole channel of the pairing interaction, neglected in the BCS, is taken into account. Moreover, second-order constraints in N2, emphasized by Lipkin and Nogami, are included automatically in the Improved BCS theory reviewed in this paper. Thus, the particle-number constraint is improved without the complications of the particle-number projections." @default.
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- W2037090765 title "Vanishing quasiparticle energies in the BCS theory and a practical solution" @default.
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- W2037090765 doi "https://doi.org/10.1016/0370-1573(95)00042-9" @default.
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