Symmetry and first-principles analysis of 2D buckled honeycomb phonons identifies nine topological phases but places real Si, Ge, P, As, Sb crystals in the trivial phase, with Monte Carlo showing why topological realizations are physically constrained.
(B2) the matrix Φ 11(0) must be in- variant under any operation belonging to the site sym- metry group C3v of atom 1, Φ11(0) =V (S)Φ11(0)V (S)t ∀S∈C3v
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Topological phonon analysis of the 2D buckled honeycomb lattice: an application to real materials
Symmetry and first-principles analysis of 2D buckled honeycomb phonons identifies nine topological phases but places real Si, Ge, P, As, Sb crystals in the trivial phase, with Monte Carlo showing why topological realizations are physically constrained.