The "topological" charge for the finite XX quantum chain
classification
❄️ cond-mat.stat-mech
keywords
chainchargefiniteoperatorquantumtopologicalboundarycertain
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It is shown that an operator (in general non-local) commutes with the Hamiltonian describing the finite XX quantum chain with certain non-diagonal boundary terms. In the infinite volume limit this operator gives the "topological" charge.
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