Haldane Gap in the Spin-1/2 Double Chain Anisotropic Heisenberg Antiferromagnet
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概要
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The double chain Heisenberg antiferromagnet with anisotropy is studied using themapping onto the coupled anisotropic nonlinear o model. This model consists of twoanisotropic antiferromagnetic quantum Heisenberg chains with half-integer spincoupled with each other via the ferromagnetic interchain coupling J'. For small J',our analysis suggests that J' is an irrelevant parameter and consequently the twochains behave independently and no gap is generated. On the other hand, for largeenough J' , the two chains behave as a single Heisenberg chain with integer spin whichhas a gap in the excitation spectrum. The expected behavior in the isotropic limit isalso discussed.[Haldane gap, antiferromagnetic Heisenberg chain, nonlinear o model, ll Kosterlitz-Thouless transitionl
- 社団法人日本物理学会の論文
- 1991-06-15
著者
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Hida K
Saitama Univ. Saitama
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Hida Kazuo
Department Of Physics Faculty Of Science Saitama University
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Hida Kazuo
Department Of Engineering Science Faculty Of Engineering Hokkaido University
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