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Complete Zero-energy Flat Bands of Surface States in Fully Gapped Chiral Noncentrosymmetric Superconductors by Lapp, Clara J.; Link, Julia M.; Timm, Carsten is a scholarly article available to read on EtoBox.

What is Complete Zero-energy Flat Bands of Surface States in Fully Gapped Chiral Noncentrosymmetric Superconductors about?

Noncentrosymmetric superconductors can support flat bands of zero-energy surface states in part of their surface Brillouin zone. This requires that they obey time-reversal symmetry and have a sufficiently strong triplet-to-singlet-pairing ratio to exhibit nodal lines in the bulk. These bands are protected by a winding number that relies on chiral symmetry, which is realized as the product of time-reversal and particle-hole symmetry. We reveal a way to stabilize a flat band in the entire surface Brillouin zone, while the bulk dispersion is fully gapped. This idea could lead to a robust platform for quantum computation and represents an alternative route to strongly correlated flat bands in two dimensions, besides twisted bilayer graphene. The necessary ingredient is an additional spin-rotation symmetry that forces the direction of the spin-orbit-coupling vector not to depend on the momentum component normal to the surface. We define a winding number that leads to flat zero-energy surface bands due to bulk-boundary correspondence. We discuss under which conditions this winding number is nonzero in the entire surface Brillouin zone and verify the occurrence of zero-energy surface stat

Author

Lapp, Clara J.; Link, Julia M.; Timm, Carsten

Published

2023

Language

EN