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Article: Emergent O(4) symmetry at the phase transition from plaquette-singlet to antiferromagnetic order in quasi-two-dimensional quantum magnets

TitleEmergent O(4) symmetry at the phase transition from plaquette-singlet to antiferromagnetic order in quasi-two-dimensional quantum magnets
Authors
KeywordsEmergent symmetry
Quantum Monte Carlo simulations
Quantum phase transitions
Quantum spin systems
Issue Date2021
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/1674-1056/
Citation
Chinese Physics B, 2021, v. 30 n. 6, p. article no. 067505 How to Cite?
AbstractRecent experiments [Guo et al., Phys. Rev. Lett. 124 206602 (2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu2(BO3)2 — the Shastry–Sutherland material — have provided strong evidence for a low-temperature phase transition between plaquette-singlet and antiferromagnetic order as a function of pressure. Further motivated by the recently discovered unusual first-order quantum phase transition with an apparent emergent O(4) symmetry of the antiferromagnetic and plaquette-singlet order parameters in a two-dimensional 'checkerboard J-Q' quantum spin model [Zhao et al., Nat. Phys. 15 678 (2019)], we here study the same model in the presence of weak inter-layer couplings. Our focus is on the evolution of the emergent symmetry as the system crosses over from two to three dimensions and the phase transition extends from strictly zero temperature in two dimensions up to finite temperature as expected in SrCu2(BO3)2. Using quantum Monte Carlo simulations, we map out the phase boundaries of the plaquette-singlet and antiferromagnetic phases, with particular focus on the triple point where these two ordered phases meet the paramagnetic phase for given strength of the inter-layer coupling. All transitions are first-order in the neighborhood of the triple point. We show that the emergent O(4) symmetry of the coexistence state breaks down clearly when the interlayer coupling becomes sufficiently large, but for a weak coupling, of the magnitude expected experimentally, the enlarged symmetry can still be observed at the triple point up to significant length scales. Thus, it is likely that the plaquette-singlet to antiferromagnetic transition in SrCu2(BO3)2 exhibits remnants of emergent O(4) symmetry, which should be observable due to additional weakly gapped Goldstone modes. Export citation and abstract
Persistent Identifierhttp://hdl.handle.net/10722/301175
ISSN
2023 Impact Factor: 1.5
2023 SCImago Journal Rankings: 0.350
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSun, G-
dc.contributor.authorMa, N-
dc.contributor.authorZhao, B-
dc.contributor.authorSandvik, AW-
dc.contributor.authorMeng, ZY-
dc.date.accessioned2021-07-27T08:07:14Z-
dc.date.available2021-07-27T08:07:14Z-
dc.date.issued2021-
dc.identifier.citationChinese Physics B, 2021, v. 30 n. 6, p. article no. 067505-
dc.identifier.issn1674-1056-
dc.identifier.urihttp://hdl.handle.net/10722/301175-
dc.description.abstractRecent experiments [Guo et al., Phys. Rev. Lett. 124 206602 (2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu2(BO3)2 — the Shastry–Sutherland material — have provided strong evidence for a low-temperature phase transition between plaquette-singlet and antiferromagnetic order as a function of pressure. Further motivated by the recently discovered unusual first-order quantum phase transition with an apparent emergent O(4) symmetry of the antiferromagnetic and plaquette-singlet order parameters in a two-dimensional 'checkerboard J-Q' quantum spin model [Zhao et al., Nat. Phys. 15 678 (2019)], we here study the same model in the presence of weak inter-layer couplings. Our focus is on the evolution of the emergent symmetry as the system crosses over from two to three dimensions and the phase transition extends from strictly zero temperature in two dimensions up to finite temperature as expected in SrCu2(BO3)2. Using quantum Monte Carlo simulations, we map out the phase boundaries of the plaquette-singlet and antiferromagnetic phases, with particular focus on the triple point where these two ordered phases meet the paramagnetic phase for given strength of the inter-layer coupling. All transitions are first-order in the neighborhood of the triple point. We show that the emergent O(4) symmetry of the coexistence state breaks down clearly when the interlayer coupling becomes sufficiently large, but for a weak coupling, of the magnitude expected experimentally, the enlarged symmetry can still be observed at the triple point up to significant length scales. Thus, it is likely that the plaquette-singlet to antiferromagnetic transition in SrCu2(BO3)2 exhibits remnants of emergent O(4) symmetry, which should be observable due to additional weakly gapped Goldstone modes. Export citation and abstract-
dc.languageeng-
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/1674-1056/-
dc.relation.ispartofChinese Physics B-
dc.rightsChinese Physics B. Copyright © Institute of Physics Publishing Ltd.-
dc.rightsThis is an author-created, un-copyedited version of an article published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/[insert DOI].-
dc.subjectEmergent symmetry-
dc.subjectQuantum Monte Carlo simulations-
dc.subjectQuantum phase transitions-
dc.subjectQuantum spin systems-
dc.titleEmergent O(4) symmetry at the phase transition from plaquette-singlet to antiferromagnetic order in quasi-two-dimensional quantum magnets-
dc.typeArticle-
dc.identifier.emailMeng, ZY: zymeng@hku.hk-
dc.identifier.authorityMeng, ZY=rp02524-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/1674-1056/abf3b8-
dc.identifier.scopuseid_2-s2.0-85110546866-
dc.identifier.hkuros323487-
dc.identifier.volume30-
dc.identifier.issue6-
dc.identifier.spagearticle no. 067505-
dc.identifier.epagearticle no. 067505-
dc.identifier.isiWOS:000665708600001-
dc.publisher.placeUnited Kingdom-

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