Spin Dynamics in a One-Dimensional Ferromagnetic Bose Gas

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• Dr Vadim Cheianov, Lancaster University
• Thursday 01 May 2008, 14:15-15:45
• TCM Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Joe Bhaseen.

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.

Work done with M. B. Zvonarev and T. Giamarchi

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