How are superconducting materials classified as gapped or gapless, also is this same as saying that a superconductor is conventional or unconventional? Could you explain how this is linked to topology or the topological order in the material?
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1Does this help? https://physics.stackexchange.com/q/169964/201709 – Superfast Jellyfish Jun 12 '20 at 06:43
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There is a discussion about it in Parks' superconductivity book vol 2 – Alexander Jun 12 '20 at 07:31
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@SuperfastJellyfish No that doesn't help at all. I am looking more from the perspective of how you could explain the properties just by looking at the configuration of the Fermi surface and make connections to topology. – Fracton Jun 12 '20 at 15:39