Many-body selection rule for quasiparticle pair creations in centrosymmetric superconductors
Junyeong Ahn,
Naoto Nagaosa
Abstract:When metal becomes superconducting, new optical excitation channels are created by particle-hole mixing. These excitation channels contribute negligibly to optical responses in most superconductors, but they can be relevant in ultra-strong-coupling superconductors that are close to the Bose-Einstein condensate regime. Recently, selection rules for these excitations have been formulated based on single-particle anti-unitary symmetries in the mean-field theory. While being potentially useful for studying optical… Show more
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