Back to Search Start Over

Chiral flat band superconductivity from symmetry-protected three-band crossings

Authors :
Lin, Yu-Ping
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