Berry phases, quantum phase transitions
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H.A. Contreras; A.F. Reyes-Lega
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Article
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2008
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Elsevier Science
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English
β 114 KB
We study the relation between Chern numbers and quantum phase transitions (QPT) in the XY spin-chain model. By coupling the spin chain to a single spin, it is possible to study topological invariants associated to the coupling Hamiltonian. These invariants contain global information, in addition to