Optical absorption by quasiparticles in superconducting multilayers

Abstract

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 EFS and EFN in the S and N layers there is one prominent resonance peak. With increasing temperature low frequency absorption goes UP. For EFS >> EFN, on the other hand, a sharp multipeak structure at low frequencies is found.

Electromagnetic absorption of semiconductor 2D Majorana nanowires

“…Similar formalisms for the absorption by quasiparticles in superconductors can be found in Refs. [27,28,29].…”

“…We use the dipole approximation to describe the optical field and consider the linear response formalism to a weak perturbation [26]. Similar formalisms for the absorption by quasiparticles in superconductors can be found in [27][28][29].…”