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Commensurate-incommensurate phase transitions for multichain quantum spin models: exact results

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dc.contributor.author Zvyagin, A.A.
dc.date.accessioned 2018-01-14T17:33:58Z
dc.date.available 2018-01-14T17:33:58Z
dc.date.issued 2000
dc.identifier.citation Commensurate-incommensurate phase transitions for multichain quantum spin models: exact results / A.A. Zvyagin // Физика низких температур. — 2000. — Т. 26, № 2. — С. 181-196. — Бібліогр.: 49 назв. — англ. uk_UA
dc.identifier.issn 0132-6414
dc.identifier.other PACS: 75.10.Jm, 11.10.Kk
dc.identifier.uri http://dspace.nbuv.gov.ua/handle/123456789/128995
dc.description.abstract The behavior in an external magnetic field is studied exactly for a wide class of multichain quantum spin models. It is shown that the magnetic field together with the interchain couplings cause commensurate-incommensurate phase transitions between the gapless phases in the ground state. The conformal limit of these models is studied and it is shown that the low-lying excitations for the incommensurate phases are not independent, because they are governed by the same magnetic field (chemical potential for excitations). A scenario for the transition from one to two space dimensions for the exactly integrable multichain quantum spin models is proposed, and it is shown that the incommensurate phases in an external magnetic field disappear in the limit of an infinite number of coupled spin chains. The similarities in the external field behavior for the quantum multichain spin models and a wide class of quantum field theories are discussed. The scaling exponents for the appearence of the gap in the spectrum of low-lying excitations of the quantum multichain models due to the relevant perturbations of the integrable theories are calculated. uk_UA
dc.description.sponsorship I am grateful to A. G. Izergin, S. V. Ketov, A. Klumper, V. E. Korepin, G. I. Japaridze, A. Luther and A. A. Nersesyan for helpful discussions. I thank J. Gruneberg for his kind help. The financial support of the Deutsche Forschungsgemeinschaft and Swedish Institute is acknowledged. uk_UA
dc.language.iso en uk_UA
dc.publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України uk_UA
dc.relation.ispartof Физика низких температур
dc.subject Низкоразмерные и неупорядоченные системы uk_UA
dc.title Commensurate-incommensurate phase transitions for multichain quantum spin models: exact results uk_UA
dc.type Article uk_UA
dc.status published earlier uk_UA


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