Alexandrov, A.S.
Beere, W.H.
Collective excitations and screening properties of a condensed charged Bose gas
The Bogoliubovâ€“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.
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2009-02-27
https://repository.lboro.ac.uk/articles/Collective_excitations_and_screening_properties_of_a_condensed_charged_Bose_gas/9409148