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Probing anomalous longitudinal fluctuations of the interacting Bose gas via Bose-Einstein condensation of magnons.

作者信息

Kreisel Andreas, Hasselmann Nils, Kopietz Peter

机构信息

Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany.

出版信息

Phys Rev Lett. 2007 Feb 9;98(6):067203. doi: 10.1103/PhysRevLett.98.067203. Epub 2007 Feb 7.

DOI:10.1103/PhysRevLett.98.067203
PMID:17358981
Abstract

The emergence of a finite staggered magnetization in quantum Heisenberg antiferromagnets subject to a uniform magnetic field can be viewed as Bose-Einstein condensation of magnons. Using nonperturbative results for the infrared behavior of the interacting Bose gas, we present exact results for the staggered spin-spin correlation functions of quantum antiferromagnets in a magnetic field at zero temperature. In particular, we show that in dimensions 1<D</=3 the longitudinal dynamic structure factor S_{ parallel}(q,omega) describing staggered spin fluctuations in the direction of the staggered magnetization exhibits a critical continuum whose weight can be controlled experimentally by varying the magnetic field.

摘要

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