Winding numbers of nodal points in Fe-based superconductors

Dmitry V. Chichinadze, Andrey V. Chubukov

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3 Scopus citations


We analyze the nodal points in multiorbital Fe-based superconductors from a topological perspective. We consider the s+ gap structure with accidental nodes, and the d-wave gap with nodes along the symmetry directions. In both cases, the nodal points can be moved by varying an external parameter, e.g., a degree of interpocket pairing. Eventually, the nodes merge and annihilate via a Lifshitz-type transition. We discuss the Lifshitz transition in Fe-based superconductors from a topological point of view. We show, both analytically and numerically, that the merging nodal points have winding numbers of opposite sign. This is consistent with the general reasoning that the total winding number is a conserved quantity in the Lifshitz transition.

Original languageEnglish (US)
Article number094501
JournalPhysical Review B
Issue number9
StatePublished - Mar 5 2018

Bibliographical note

Funding Information:
We thank A. Hinojosa, D. Shaffer, and O. Vafek for useful discussions. The work was supported by the Office of Basic Energy Sciences, US Department of Energy under Award No. DE-SC0014402.

Publisher Copyright:
© 2018 American Physical Society.


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