scholarly journals Spin-orbit coupling and spin-triplet pairing symmetry in Sr2RuO4

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
Zhiqiang Wang ◽  
Xin Wang ◽  
Catherine Kallin
Keyword(s):  
Pairing Symmetry ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Triplet Pairing ◽  
Spin Triplet

scholarly journals Spin–Orbit Coupling and Multiple phases in Spin-Triplet Superconductor Sr2RuO4

2014 ◽  
Vol 83 (6) ◽  
pp. 061019 ◽  
Author(s):  
Youichi Yanase ◽  
Shuhei Takamatsu ◽  
Masafumi Udagawa
Keyword(s):  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Spin Triplet

scholarly journals Paramagnetic Pair-Breaking in Spin-Triplet Superconductors with Spin–Orbit Coupling: Application to Sr2RuO4

2019 ◽  
Vol 88 (6) ◽  
pp. 064707 ◽  
Author(s):  
Koushi Oda ◽  
Kenta K. Tanaka ◽  
Seiichiro Onari ◽  
Masanori Ichioka
Keyword(s):  
Orbit Coupling ◽  
Pair Breaking ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Spin Triplet

scholarly journals Theory of optical responses in clean multi-band superconductors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Junyeong Ahn ◽  
Naoto Nagaosa
Keyword(s):  
Pairing Symmetry ◽  
Orbit Coupling ◽  
Optical Measurements ◽  
Inversion Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Clean Limit ◽  
Optical Responses ◽  
Optical Excitations ◽  
Multi Band

AbstractElectromagnetic 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 dirty-limit 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) symmetry protection of the Bogoliubov Fermi surfaces, or (iii) simply finite spin-orbit coupling with unbroken time reversal and inversion symmetries. This result indicates that clean-limit optical responses are common beyond the straightforward case of broken inversion symmetry. We apply our theory to optical responses in FeSe, a clean multi-band superconductor with inversion symmetry and significant spin-orbit coupling. This result paves the way for studying clean-limit superconductors through optical measurements.

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