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Optical absorption by quasiparticles in superconducting multilayers
Author(s) -
Plehn H.,
Kümmel R.
Publication year - 1996
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.2065080703
Subject(s) - quasiparticle , condensed matter physics , scattering , superconductivity , absorption (acoustics) , physics , photon , field (mathematics) , materials science , optics , mathematics , pure mathematics
The absorption of photons by quasiparticles in the Bloch bands of multilayers, formed by alternating normal ( N ) and superconducting ( S ) regions, is computed for the vector of the oscillating electric field being perpendicular to the N‐S interfaces. The absorption spectrum extends down to frequencies below the gap of the S ‐layers, and its structure results from the combined effects of Andreev scattering and conventional scattering at the N‐S interfaces. For not too different Fermi energies ϵ FS and ϵ FN in the S and N layers there is one prominent resonance peak. With increasing temperature low frequency absorption goes up. For ϵ FS ≫ ϵ FN , on the other hand, a sharp multipeak structure at low frequencies is found.