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arXiv 0801.3688cond-mat.stat-mechhep-th
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具有N体吸引相互作用的一维玻色气体

One-Dimensional Bose Gases with N-Body Attractive Interactions

E. Fersino, G. Mussardo, A. Trombettoni

摘要:

研究了具有N体吸引接触相互作用的一维玻色气体的基态性质。利用广义非线性薛定谔方程亮孤子解的显式形式,计算了化学势和基态能量。当N=3时,局域孤子波函数只存在于相互作用强度的一个临界值:在这种情况下,基态具有无限简并度,可以用化学势来参数化。讨论了外谐波陷阱对亮孤子解的稳定作用,并与高维N体吸引接触相互作用的稳定作用进行了比较。

英文摘要:

We study the ground state properties of a one-dimensional Bose gas with N-body attractive contact interactions. By using the explicit form of the bright soliton solution of a generalized nonlinear Schroedinger equation, we compute the chemical potential and the ground state energy. For N=3, a localized soliton wave-function exists only for a critical value of the interaction strength: in this case the ground state has an infinite degeneracy that can be parameterized by the chemical potential. The stabilization of the bright soliton solution by an external harmonic trap is also discussed, and a comparison with the effect of N-body attractive contact interactions in higher dimensions is presented.

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