A single vacancy in an anisotropic honeycomb lattice carries winding number ∓1 below t'/t=2 and exactly 0 at and above t'/t=2, a topological phase transition driven by Dirac-valley annihilation.
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Vacancy-Induced Topological Phase Transition via Valley Annihilation in an Anisotropic Honeycomb Lattice
A single vacancy in an anisotropic honeycomb lattice carries winding number ∓1 below t'/t=2 and exactly 0 at and above t'/t=2, a topological phase transition driven by Dirac-valley annihilation.