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1 Wu, Yong-ShiGeneral theorem relating the bulk topological number to edge states in two-dimensional insulatorsWe prove a general theorem on the relation between the bulk topological quantum number and the edge states in two-dimensional insulators. It is shown that whenever there is a topological order in bulk, characterized by a nonvanishing Chern number, even if it is defined for a nonconserved quantity s...Edge states; Bulk topology; Chern number2006-07
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