Spin waves in a one-dimensional spinor Bose gas

Details Spin waves in a one-dimensional spinor Bose gas Spin waves in a one-dimensional spinor Bose gas

2005-07-22

arxiv.org/abs/cond-mat/0507513v1

Phys. Rev. Lett. 95, 150402 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.95.150402

We study a one-dimensional (iso)spin 1/2 Bose gas with repulsive delta-function interaction by the Bethe Ansatz method and discuss the excitations above the polarized ground state. In addition to phonons the system features spin waves with a quadratic dispersion. We compute analytically and numerically the effective mass of the spin wave and show that the spin transport is greatly suppressed in the strong coupling regime, where the isospin-density (or ``spin-charge'') separation is maximal. Using a hydrodynamic approach, we study spin excitations in a harmonically trapped system and discuss prospects for future studies of two-component ultracold atomic gases.

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