Abstract
We study the energy eigenvalue and the yrast states for a harmonicallytwo-component weak-interacting Bose–Einstein condensate (BEC) when theintra-species and interspecies scattering length are different. Theenergy shift for different energy eigenvalues related to intra- andinterspecies scattering lengths is calculated with the perturbationmethod. The actual yrast spectrum is more complicated than that whenintra-species and interspecies scattering length are equal. Thedegenerated features disappear and so do the perfect symmetricfeatures.
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