Probing anomalous longitudinal fluctuations of the interacting Bose gas via Bose-Einstein condensation of magnons |
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| Authors: | Kreisel Andreas Hasselmann Nils Kopietz Peter |
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| Affiliation: | Institut für Theoretische Physik, Universit?t Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany. |
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| 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
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