Abstract
The acoustic plasmon is considered as a possible low energy excitation mode in a simple two-band (s andd) model. Going an order further than the random phase approximation allows the exchange interactions to be taken into account. Under certain conditions the acoustic plasmon exchange between thes electrons can lead to the formation of Cooper pairs. The dielectric function approximation is used to derive a simple expression for the superconducting transition temperature in first order of the exchange interactions.
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Tüttő, I. Role of exchange interaction in the formation of acoustic plasmons. J Low Temp Phys 58, 351–362 (1985). https://doi.org/10.1007/BF00681311
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DOI: https://doi.org/10.1007/BF00681311