Commensurate-incommensurate phase transitions for multichain quantum spin models: exact results
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Commensurate-incommensurate phase transitions for multichain quantum spin models: exact results
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| Creator |
Zvyagin, A.A.
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| Subject |
Низкоразмерные и неупорядоченные системы
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| Description |
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.
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| Date |
2018-01-14T17:33:58Z
2018-01-14T17:33:58Z 2000 |
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| Type |
Article
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| Identifier |
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.
0132-6414 PACS: 75.10.Jm, 11.10.Kk http://dspace.nbuv.gov.ua/handle/123456789/128995 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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