Dynamical Structure Factor and Spin-Density Separation for a Weakly-Interacting Two-Component Bose Gas

Details Dynamical Structure Factor and Spin-Density Separation for a Weakly-Interacting Two-Component Bose Gas Dynamical Structure Factor and Spin-Density Separation for a Weakly-Interacting Two-Component Bose Gas

2008-02-26

arxiv.org/abs/0802.3818v5

Physics

Condensed Matter

Other Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.101.070402

We show that spin-density separation in a Bose gas is not restricted to 1D but also occurs in higher dimension. The ratio ($\alpha$) of the intra-species atom-atom interaction strength to the inter-species interaction strength, strongly influences the dynamics of spin-density separation and the elementary excitations. The density wave is phonon-like for all values of $\alpha$. For $\alpha<1$, spin wave is also phonon-like. The spin waves have a quadratic dispersion in the $\alpha=1$ coupling regime, while in the phase separated regime ($\alpha>1$) the spin waves are found to be damped. The dynamical structure factor (DSF) reveals two distinct peaks corresponding to the density and spin waves for $\alpha \le 1$. For $\alpha > 1$ there is only one DSF peak corresponding to the density wave.

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