A single random interlayer hopping defect creates an in-gap bound state that crosses mid-gap only in the trivial phase, and random interlayer tunneling can close the gap and degrade quantized edge conductance.
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Theory of off-diagonal disorder in multilayer topological insulator
A single random interlayer hopping defect creates an in-gap bound state that crosses mid-gap only in the trivial phase, and random interlayer tunneling can close the gap and degrade quantized edge conductance.