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Chiral flat band superconductivity from symmetry-protected three-band crossings
- Source :
- Phys. Rev. Research 2, 043209 (2020)
- Publication Year :
- 2019
-
Abstract
- We show that chiral (nearly) flat band superconductivity can develop and host novel Majorana fermions at a time-reversal pair of symmetry-protected three-band crossing points. Based on symmetry analysis, mean-field study, and superfluid stiffness calculation, we determine and analyze the irreducible pairing channels with flat band pairings in the low-energy spin-$1$ fermion theory. Flat band pairing can enhance superconductivity dramatically, where the critical temperature scales linearly in the interaction strength. While fully gapped flat band pairing states develop in the single-component pairing channels, we find chiral $\bar p\pm i\bar p$ flat band superconductivity in the multicomponent pairing channels. Three-dimensional itinerant Majorana fermions arise at the bulk nodal points, whereas Majorana arcs appear on the surface.<br />Comment: 10 pages, 3 figures. v3: Published version
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Research 2, 043209 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1911.01436
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevResearch.2.043209