Cuts of the Fermi surface (yellow) of a quasi-two-dimensional thin film and closed loop where the pairing function changes sign (green dashed line), indicating the presence of a helical topological superconductor phase.
From the article:
Intrinsic Time-Reversal-Invariant Topological Superconductivity in Thin Films of Iron-Based SuperconductorsRui-Xing Zhang and S. Das Sarma
Phys. Rev. Lett. 126, 137001 (2021)
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