D. Coffey 1997 Europhys. Lett. 40 563 doi:10.1209/epl/i1997-00506-9
D. Coffey
Show affiliationsI investigate the difference between the quasiparticle properties in two-dimensional (2D) and three-dimensional (3D) s-wave superconductors. Using the original BCS model for the pairing interaction and direct Coulomb interaction I show that quasiparticle interactions lead to a stronger energy dependence in the single-particle self-energies in 2D than in 3D superconductors. This difference arises from the presence of the low-lying collective mode of the order parameter in the 2D case which ensures that oscillator strength in the response function is at low frequencies, ~ Δ. This strong quantitative difference between 2D and 3D superconductors points to the importance of treating quasiparticle interactions in low-dimensional superconductors rather than assuming that renormalizations remain unchanged from the normal state.
Issue 5 (1 December 1997)
Received 25 July 1997, accepted for publication 14 October 1997, in final form 14 October 1997
D. Coffey 1997 Europhys. Lett. 40 563
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