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SUMMARY:Spin Dynamics in a One-Dimensional Ferromagnetic Bose Gas - Dr Vad
 im Cheianov\, Lancaster University
DTSTART:20080501T131500Z
DTEND:20080501T144500Z
UID:TALK11025@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:We investigate the propagation of spin excitations in a\none-d
 imensional ferromagnetic Bose gas. While the spectrum of longitudinal spin
  waves in this system is soundlike\, the dispersion of transverse spin exc
 itations is quadratic\, making a direct application of the Luttinger liqui
 d theory impossible. By using a combination of different analytic methods 
 we derive the large time asymptotic behavior of the spin-spin dynamical co
 rrelation function for strong interparticle repulsion. The result has an u
 nusual structure associated with a crossover from the regime of trapped sp
 in wave to an\nopen regime and does not have analogues in known low-energy
  universality classes of quantum 1D systems.\n\nWork done with M. B. Zvona
 rev and T. Giamarchi
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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