Non-perturbative formulation for zero mode of Bose-Einstein condensate

秀樹 松本

Takahashi Jun'ichi, Yuto Hayaki, Y. Yamanaka

Junichi Takahashi, Yusuke Nakamura, Y. Yamanaka

J.-B. Bru, Valentin Anatol'evich Zagrebnov

We present an exactly soluble boson model which manifests two kinds of condensation. They occur in two stages: for intermediate densities one has a non-conventional Bose condensation in the lowest mode k = 0, which is due to a diagonal perturbation of the imperfect Bose gas Hamiltonian, whereas for large densities , this condensation coexists with conventional (generalized, non-extensive) Bose-Einstein condensation in non-zero modes condensation, corresponding to the standard mechanism of saturation.

F. Cruz, Marcus Benghi Pinto, Rudnei O. Ramos

M. Corgini

A stable non ideal Bose system whose energy operator includes a perturbations depending on the square root of the number operator associated to the zero mode energy is analyzed, demonstrating that, in presence or absence of a gap in the one particle energy spectrum,it undergoes the so called non conventional Bose Einstein Condensation