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arxiv: 1009.3792 · v1 · submitted 2010-09-20 · ❄️ cond-mat.mes-hall · cond-mat.str-el

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Z_Q Topological Invariants for Polyacetylene, Kagome and Pyrochlore lattices

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classification ❄️ cond-mat.mes-hall cond-mat.str-el
keywords invariantstopologicalkagomepolyacetylenepyrochloreadiabaticberrycase
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Adiabatic $Z_Q$ invariants by quantized Berry phases are defined for gapped electronic systems in $d$-dimensions ($Q=d+1$). This series includes Polyacetylene, Kagome and Pyrochlore lattice respectively for $d=1,2$ and 3. The invariants are quantum $Q$-multimer order parameters to characterize the topological phase transitions by the multimerization. This fractional quantization is protected by the global $Z_Q$ equivalence. As for the chiral symmetric case, a topological form of the $Z_2$-invariant is explicitly given as well.

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