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Nonlinear σ model treatment of quantum antiferromagnets in a magnetic field

Normand, B. and Kyriakidis, J. and Loss, D.. (2000) Nonlinear σ model treatment of quantum antiferromagnets in a magnetic field. Annalen der Physik, Vol. 9, H. 2. pp. 133-159.

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Official URL: http://edoc.unibas.ch/dok/A5254748

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Abstract

We present a theoretical analysis of the properties of low-dimensional quantum antiferromagnets in applied magnetic fields. In a nonlinear a model description, we use a spin stiffness analysis, a 1/N expansion, and a renormalization group approach to describe the broken-symmetry regimes of finite magnetization, and, in cases of most interest, a low-field regime where symmetry is restored by quantum fluctuations. We compute the magnetization, critical fields, spin correlation functions, and decay exponents accessible by nuclear magnetic resonance experiments. The model is relevant to many systems exhibiting Haldane physics, and provides good agreement with data for the two-chain spin ladder compound CuHpCl.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Wiley-VCH
ISSN:0003-3804
Note:Variant title: Nonlinear sigma model treatment of quantum antiferromagnets in a magnetic field -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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