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Effects of defects in the XY chain with frustrated boundary conditions

Torre, Gianpaolo; Marić, Vanja; Franchini, Fabio; Giampaolo, Salvatore Marco (2021) Effects of defects in the XY chain with frustrated boundary conditions. Physical Review B, 103 (1). ISSN 2469-9950

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It has been recently proven that new types of bulk local order can ensue due to frustrated boundary condition, that is, periodic boundary conditions with an odd number of lattice sites and antiferromagnetic interactions. For the quantum XY chain in zero external fields, the usual antiferromagnetic order has been found to be replaced either by a mesoscopic ferromagnet or by an incommensurate AFM order. In this work we examine the resilience of these new types of orders against a defect that breaks the translational symmetry of the model. We find that, while a ferromagnetic defect restores the traditional, staggered order, an AFM one stabilizes the incommensurate order. The robustness of the frustrated order to certain kinds of defects paves the way for its experimental observability.

Item Type: Article
Uncontrolled Keywords: Order parameters; Quantum phase transitions
Subjects: NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions: Theoretical Physics Division
Project titleProject leaderProject codeProject type
Novel Characterizations of Classical and Quantum Many-Body Systems-ManyBodyCharacterizaFabio FranchiniIP-2016-06-3347HRZZ
Frustrirani kompleksni sustavi-FCSSalvatore Marco GiampaoloIP-2019-04-3321HRZZ
Depositing User: Fabio Franchini
Date Deposited: 27 Jan 2021 13:57
DOI: 10.1103/PhysRevB.103.014429

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