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.
Engineering Topological Materials
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abstract
The tenfold classification provides a powerful framework for organizing topological phases of matter based on symmetry and spatial dimension. However, it does not offer a systematic method for transitioning between classes or engineering materials to realize desired topological properties. In this work, we introduce a general method for designing topological materials by embedding defects or spatial textures, which alter symmetry or dimension. This enables controlled navigation across the tenfold table, allowing one to induce topological phase transitions on demand. We illustrate this approach through several nontrivial examples, demonstrating how local defects can generate phases with different symmetries and topological invariants.
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cond-mat.mes-hall 1years
2026 1verdicts
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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.