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arXiv 0708.3548cond-mat.othercond-mat.str-el
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硬壁阱中具有吸引p波相互作用的一维费米子气体

One-dimensional fermionic gases with attractive p-wave interaction in a hard-wall trap

Yajiang Hao, Yunbo Zhang, Shu Chen

摘要:

我们研究了封闭在具有吸引接触p波相互作用的硬壁陷阱中的一维费米子系统的基态。基于Bethe近似方法,通过数值求解Bethe近似方程,得到了全物理区($-\infty \leq c_F\leq 0$)的显式波函数。利用精确的波函数,得到了多体物理中的一些重要物理量,包括有限系统的单体密度矩阵和基态的动量分布。结果表明,随着相互作用的增加,密度分布的壳结构消失,在费米Tonks-Girardeau(FTG)极限下,密度分布表现出与理想玻色气体相同的行为.然而,单体密度矩阵和动量分布表现出完全不同的结构相比,他们的玻色子。

英文摘要:

We investigate the ground state of the one-dimensional fermionic system enclosed in a hard-wall trap with attractive contact p-wave interactions. Based on the Bethe ansatz method, the explicit wave function is derived by numerically solving the Bethe ansatz equations for the full physical regimes ($-\infty \leq c_F\leq 0$). With the exact wave function some quantities which are important in many-body physics are obtained, including the one-body density matrix and the momentum distribution of the ground state for finite system. It is shown that the shell structure of the density profiles disappears with the increase of the interaction and in the fermionic Tonks-Girardeau (FTG) limit the density distribution shows the same behavior as that of an ideal Bose gas. However the one-body density matrix and the momentum distribution exhibit completely different structures compared with their bosonic counterparts.

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