Two-component boson systems with hyperspherical coordinates

Details Two-component boson systems with hyperspherical coordinates Two-component boson systems with hyperspherical coordinates

2004-03-08

arxiv.org/abs/cond-mat/0403208v1

Physics

Condensed Matter

Other Condensed Matter

submitted to Journal of Physics B

Scientific paper

10.1088/0953-4075/37/10/011

The effective potential is computed for two boson systems in one trap as a function of their two individual hyperadii and the distance between their centers. Zero-range interactions are used and only relative s-states are included. Existence and properties of minima are investigated as a function of these three collective coordinates. For sufficiently strong repulsion stable structures are found at a finite distance between the centers. The relative center of masses motion corresponds to the lowest normal mode. The highest normal mode is essentially the breathing mode where the subsystems vibrate by scaling their radii in phase. The intermediate normal mode corresponds to isovector motion where the subsystems vibrate by scaling their radii in opposite phase. Stability conditions are established as substantially more restrictive than in mean-field computations.

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