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Article: Amplitude Mode in Quantum Magnets via Dimensional Crossover

TitleAmplitude Mode in Quantum Magnets via Dimensional Crossover
Authors
Issue Date2021
PublisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/
Citation
Physical Review Letters, 2021, v. 126 n. 22, p. article no. 227201 How to Cite?
AbstractWe investigate the amplitude (Higgs) mode associated with longitudinal fluctuations of the order parameter at the continuous spontaneous symmetry breaking phase transition. In quantum magnets, due to the fast decay of the amplitude mode into low-energy Goldstone excitations, direct observation of this mode represents a challenging task. By focusing on a quasi-one-dimensional geometry, we circumvent the difficulty and investigate the amplitude mode in a system of weakly coupled spin chains with the help of quantum Monte Carlo simulations, stochastic analytic continuation, and a chain-mean field approach combined with a mapping to the field-theoretic sine-Gordon model. The amplitude mode is observed to emerge in the longitudinal spin susceptibility in the presence of a weak symmetry-breaking staggered field. A conventional measure of the amplitude mode in higher dimensions, the singlet bond mode, is found to appear at a lower than the amplitude mode frequency. We identify these two excitations with the second (first) breather of the sine-Gordon theory, correspondingly. In contrast to higher-dimensional systems, the amplitude and bond order fluctuations are found to carry significant spectral weight in the quasi-1D limit.
Persistent Identifierhttp://hdl.handle.net/10722/300328
ISSN
2021 Impact Factor: 9.185
2020 SCImago Journal Rankings: 3.688
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZHOU, C-
dc.contributor.authorYan, Z-
dc.contributor.authorWu, HQ-
dc.contributor.authorSun, K-
dc.contributor.authorStarykh, OA-
dc.contributor.authorMeng, Z-
dc.date.accessioned2021-06-04T08:41:23Z-
dc.date.available2021-06-04T08:41:23Z-
dc.date.issued2021-
dc.identifier.citationPhysical Review Letters, 2021, v. 126 n. 22, p. article no. 227201-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/300328-
dc.description.abstractWe investigate the amplitude (Higgs) mode associated with longitudinal fluctuations of the order parameter at the continuous spontaneous symmetry breaking phase transition. In quantum magnets, due to the fast decay of the amplitude mode into low-energy Goldstone excitations, direct observation of this mode represents a challenging task. By focusing on a quasi-one-dimensional geometry, we circumvent the difficulty and investigate the amplitude mode in a system of weakly coupled spin chains with the help of quantum Monte Carlo simulations, stochastic analytic continuation, and a chain-mean field approach combined with a mapping to the field-theoretic sine-Gordon model. The amplitude mode is observed to emerge in the longitudinal spin susceptibility in the presence of a weak symmetry-breaking staggered field. A conventional measure of the amplitude mode in higher dimensions, the singlet bond mode, is found to appear at a lower than the amplitude mode frequency. We identify these two excitations with the second (first) breather of the sine-Gordon theory, correspondingly. In contrast to higher-dimensional systems, the amplitude and bond order fluctuations are found to carry significant spectral weight in the quasi-1D limit.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/-
dc.relation.ispartofPhysical Review Letters-
dc.rightsCopyright [2021] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevLett.126.227201].-
dc.titleAmplitude Mode in Quantum Magnets via Dimensional Crossover-
dc.typeArticle-
dc.identifier.emailYan, Z: zhengyan@hku.hk-
dc.identifier.emailMeng, Z: zymeng@hku.hk-
dc.identifier.authorityMeng, Z=rp02524-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevLett.126.227201-
dc.identifier.pmid34152175-
dc.identifier.scopuseid_2-s2.0-85107717472-
dc.identifier.hkuros322729-
dc.identifier.volume126-
dc.identifier.issue22-
dc.identifier.spagearticle no. 227201-
dc.identifier.epagearticle no. 227201-
dc.identifier.isiWOS:000657180900006-
dc.publisher.placeUnited States-

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