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Theory of optical responses in clean multi-band superconductors | | Junyeong Ahn
; Naoto Nagaosa
; | | Date: |
6 Oct 2020 | | Abstract: | Electromagnetic responses in superconductors provide valuable information on
the pairing symmetry as well as physical quantities such as the superfluid
density. However, at the superconducting gap energy scale, optical excitations
of the Bogoliugov quasiparticles are forbidden in conventional
Bardeen-Cooper-Schrieffer superconductors when momentum is conserved.
Accordingly, far-infrared optical responses have been understood in the
framework of a momentum-non-conserving theory by Mattis and Bardeen for over 60
years. Here we show, by investigating the selection rules imposed by
particle-hole symmetry and unitary symmetries, that intrinsic
momentum-conserving optical excitations can occur in clean multi-band
superconductors when one of the following three conditions is satisfied: (i)
inversion symmetry breaking, (ii) the emergence of the Bogoliubov Fermi
surfaces, or (iii) simply finite spin-orbit coupling with unbroken time
reversal and inversion symmetries. We apply our theory to optical responses in
FeSe, a clean multi-band superconductor with significant spin-orbit coupling.
This result paves the way for studying clean-limit superconductors through
optical measurements. | | Source: | arXiv, 2010.02956 | | Services: | Forum | Review | PDF | Favorites | |
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