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Phase transitions through excited-state level crossings and topological indicators: the case of the XXZ chain with staggered Ising interaction
We combine two ways of determining the phase diagram of the spin-$1/2$ XXZ chain with a staggered Ising interaction and uniform transverse exchange, based on exact diagonalization. The model realizes a competition between Néel order and bond-dimerized phases generated by the alternating Ising intera
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