Degenerate topological line surface phonons in quasi-1D double helix crystal SnIP
Degenerate topological line surface phonons in quasi-1D double helix crystal SnIP
Degenerate points/lines in the bulk band structures of crystals have become a staple of the growing number of topological materials. The bulk-boundary correspondence provides a relation between bulk topology and surface states. While line degeneracies of bulk excitations have been extensively characterized, line degeneracies of surface states are not well …