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Abstract: We investigate the propagation of spin excitations in a one-dimensional 1Dferromagnetic Bose gas. While the spectrum of longitudinal spin waves in thissystem is sound-like, the dispersion of transverse spin excitations isquadratic making a direct application of the Luttinger Liquid LL theoryimpossible. By using a combination of different analytic methods we derive thelarge time asymptotic behavior of the spin-spin dynamical correlation functionfor strong interparticle repulsion. The result has an unusual structureassociated with a crossover from the regime of trapped spin wave to an openregime and does not have analogues in known low-energy universality classes ofquantum 1D systems.



Autor: M. B. Zvonarev, V. V. Cheianov, T. Giamarchi

Fuente: https://arxiv.org/







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