Collective excitations and screening properties of a condensed charged Bose gas
A. S. Alexandrov, William H. Beere
The Bogoliubov--de Gennes (BdG) type equations are derived for the Coulomb Bose gas describing the electrodynamics of charged bosons. The gauge invariant dielectric response function and collective excitations of a charged Bose gas at T=0 are found. We find a plasmon branch which is the same as the single-particle Bogoliubov spectrum in agreement with the textbook result. The superconducting properties of the charged Bose gas are verified. A gauge-invariant formalism for calculating the response of the supracondensate particles is proposed.
Physical review. B, Condensed matter•Mar 1, 1995•28 citations