Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 24: Ultra-Cold Atoms, Ions and BEC II (with Q)

A 24.3: Vortrag

Donnerstag, 5. März 2009, 11:15–11:30, VMP 6 HS-C

dynamical structure factor and spin-density separation for a weakly-interacting two-component Bose gas — •Ming-Chiang Chung — Academia Sinica Taiwan

We show that spin-density separation in a Bose gas is not restricted to 1D but also occurs in higher dimension. The ratio (α) 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 α. For α<1, spin wave is also phonon-like. The spin waves have a quadratic dispersion in the α=1 coupling regime, while in the phase separated regime (α>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 α ≤ 1. For α > 1 there is only one DSF peak corresponding to the density wave.