Eur. Phys. J. D 2, 1-4 (1998)
https://doi.org/10.1007/s100530050101

BCS states as squeezed fermion-pair states

Department of Physics, Shanxi University, Taiyuan 030006, P.R. China

Corresponding author: ^a itpshu@public.ty.sx.cn

Received: 8 September 1997
Revised: 28 November 1997
Accepted: 29 January 1998
Published online: 15 April 1998

Abstract

A new formulation of the Bogoliubov-Valatin transformation explicitly parameter-dependent and with no quasiparticle operators is derived and applied to a diagonalization of the BCS reduced Hamiltonian in the particle space. It is shown that the eigenstates of this Hamiltonian are just the BCS states and are a kind of squeezed fermion-pair states as well.