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Fate of local order in topologically frustrated spin chains

Marić, Vanja; Giampaolo, Salvatore Marco; Franchini, Fabio (2022) Fate of local order in topologically frustrated spin chains. Physical Review B, 105 (6). ISSN 2469-9950

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It has been recently shown that the presence of topological frustration, induced by periodic boundary conditions in an antiferromagnetic XY chain made of an odd number of spins, prevents the realization of a perfectly staggered local order. Starting from this result and exploiting a recently introduced approach which enables the direct calculation of the expectation value of any operator with support over a finite range of lattice sites, in this work we investigate the possible fates of local orders. We show that, regardless of the variety of possible situations, they can be all arranged in two different cases. A system admits a finite local order only if the ground state is degenerate, with at least two elements whose momenta differ, in the thermodynamic limit, by π, and this order breaks translational symmetry. In all other cases, any local order decays to zero, algebraically (or faster) in the chain length. Moreover, we show that, in some cases, which of the two possibilities is realized, may depend on the sequence of chain lengths with which the thermodynamic limit is reached. These results are established both analytically and by exact diagonalization and illustrated through examples.

Item Type: Article
Uncontrolled Keywords: Quantum Spin Chains; Frustration; Local order
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions: Theoretical Physics Division
Project titleProject leaderProject codeProject type
Frustrirani kompleksni sustavi-FCSSalvatore Marco Giampaolo; Tena DubčekIP-2019-04-3321HRZZ
Novel Characterizations of Classical and Quantum Many-Body Systems-ManyBodyCharacterizaFabio FranchiniIP-2016-06-3347HRZZ
Depositing User: Fabio Franchini
Date Deposited: 27 Feb 2024 10:42
DOI: 10.1103/PhysRevB.105.064408

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