COLLECTIVE OSCILLATIONS IN TWO-BAND SUPERCONDUCTING SYSTEMS WITH LOW CHARGE CARRIER DENSITY

摘要

Collective oscillations in two-band superconductors with low charge carrier den- sity, caused by fluctuations of phases and amplitudes of order parameters from different bands, are studied. The Bose-condensation state of localized pairs (μ_n<0,μ_n is the renormalized chemical potential for nth band) inherent in low carrier densities is considered.