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Yifu Cao

As seen in: Nature, Physical Review B
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Articles

Spin fluctuations in the ultranodal superconducting state of Fe(Se,S)

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By Yifu Cao, Chandan Veerabhadra Setty, Andreas Kreisel, Laura Fanfarillo
| Physical Review B
Abstract The iron-based superconductor FeSe isovalently substituted with S displays an abundance of remarkable phenomena that have not been fully understood, at the center of which are apparent zero-energy excitations in the superconducting state in the tetragonal phase. The phenomenology has been generally consistent with the proposal of the so-called ultranodal states where Bogoliubov Fermi surfaces (BFSs) are present.
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Microscopic origin of ultranodal superconducting states in spin-$\frac{1}{2}$ systems

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By Yifu Cao, Chandan Veerabhadra Setty, Laura Fanfarillo, Andreas Kreisel
| Physical Review B
Several unconventional superconductors show indications of zero-energy excitations in the superconducting state consistent with the existence of a so-called Bogoliubov-Fermi surface (BFS).
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Topological ultranodal pair states in iron-based superconductors

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By Andreas Kreisel, Chandan Veerabhadra Setty, Shinibali Bhattacharyya, Yifu Cao
| Nature Verified
Abstract Bogoliubov Fermi surfaces are contours of zero-energy excitations that are protected in the superconducting state. Here we show that multiband superconductors with dominant spin singlet, intraband pairing of spin-1/2 electrons can undergo a transition to a state with Bogoliubov Fermi surfaces if spin-orbit coupling, interband pairing and time reversal symmetry breaking are also present.
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