Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-11-05
J. Stat. Mech. Theor. Exp., P02027 (2009)
Physics
Condensed Matter
Other Condensed Matter
17 pages
Scientific paper
10.1088/1742-5468/2009/02/P02027
We consider a model of one dimensional spin-1 bosons with repulsive density-density interactions and antiferromagnetic exchange. We show that the low energy effective field theory is given by a spin-charge separated theory of a Tomonaga-Luttinger Hamiltonian and the O(3) nonlinear sigma model describing collective charge and spin excitations respectively. At a particular ratio of the density-density to spin-spin interaction the model is integrable, and we use the exact solutions to provide an independent derivation of the low energy effective theory. The system is in a superfluid phase made of singlet pairs of bosons, and we calculate the long-distance asymptotics of certain correlation functions.
Essler Fabian H. L.
Shlyapnikov Georgy V.
Tsvelik Alexei M.
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