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Seminars & Lectures

* TITLE

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

* SPEAKERS

Name	Affiliation	E-mail
Dr. Ming-Chiang Chung	Academia Sinica, Taiwan	xinwan(at)apctp.org

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2008-10-09, 15:00-14:00

* PLACE

Conference Room 512, APCTP, Hogil Memorial Bldg., POSTECH, Pohang, Korea

* ABSTRACT

We show that spin-density separation in a Bose gas is not restricted to 1D but also occurs in higher dimensions. The ratio (alpha) of the intraspecies atom-atom interaction strength to the interspecies interaction strength strongly influences the dynamics of spin-density separation and the elementary excitations. The density wave is phononlike for all values of alpha. For alpha<1, the spin wave is also phononlike. 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 reveals two distinct peaks corresponding to the density and spin waves for alpha<=1. For alpha>1 there is only one dynamical structure factor peak corresponding to the density wave.

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