Physics – Condensed Matter
Scientific paper
2002-02-06
Physics
Condensed Matter
13 pages,3 figures
Scientific paper
10.1016/S0378-4371(02)01391-2
The equilibrium and stability properties of a coupled two-component BEC is studied using a variational method and the one-dimensional model of Williams and collaborators. The variational parameters are the population fraction, translation and scaling transformation of the condensate densities, assumed to have a Gaussian shape. We study the equilibrium and stability properties as a function of the strength of the laser field and the traps displacement. We find many branches of equilibrium configurations, with a host of critical points. In all cases, the signature of the onset of criticality is the collapse of a normal mode which is a linear combination of the out of phase translation and an in phase breathing oscillation of the condensate densities. Our calculations also indicate that we have symmetry breaking effects when the traps are not displaced
de Passos Emerson José Veloso
Hussein Mahir S.
Lee Da-Shin
Lin Chi-Yong
Toledo Piza F. de R. de A.
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