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Spin-directed network model for the surface states of weak three-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="double-struck">Z</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>topological insulators
The authors construct a network model of helical edge states that describes localization and transport properties on the surface of a weak three-dimensional topological insulator with time-reversal symmetry.