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Spin dynamics in a one-dimensional ferromagnetic Bose Gas.

Research output: Contribution to journalJournal article

Published

Journal publication date13/12/2007
JournalPhysical Review Letters
Journal number24
Volume99
Pages240404
Original languageEnglish

Abstract

We investigate the propagation of spin excitations in a one-dimensional ferromagnetic Bose gas. While the spectrum of longitudinal spin waves in this system is soundlike, the dispersion of transverse spin excitations is quadratic, making a direct application of the Luttinger liquid theory impossible. By using a combination of different analytic methods we derive the large time asymptotic behavior of the spin-spin dynamical correlation function for strong interparticle repulsion. The result has an unusual structure associated with a crossover from the regime of trapped spin wave to an open regime and does not have analogues in known low-energy universality classes of quantum 1D systems.