arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.3564cond-mat.supr-concond-mat.quant-gas
收藏

囚禁费米原子气体p波超流体中的涡旋

Vortices in p-Wave Superfluids of Trapped Fermionic Atom Gases

Y. Tsutsumi, K. Machida

摘要:

为了帮助研究超流性,我们从理论上研究了在三维简谐势作用下中性费米子原子气体中的p波配对超流。Ginzburg-Landau框架是p波超流体的通用框架,用来描述序参量的空间结构,即由静止和旋转时的l矢量表征的结构.由于陷阱的存在,l-矢量位形受到边界条件的强烈约束。研究发现,在静止时,基态织构具有自发超电流,雪茄形和煎饼形陷阱都有。电流方向取决于陷印形状。在旋转条件下,一对具有半缠绕数的半量子涡旋进入系统,并在两种陷阱几何中稳定。并对它们的三维结构进行了详细的解释。随着旋转速度的增加,凝结体的形状发生了变化,这与凝结体在涡核中被压低的底层涡的形成密切相关。

英文摘要:

In order to help detecting superfluidity, we theoretically investigate p-wave pairing superfluids in neutral Fermion atom gases confined by a three dimensimentional (3D) harmonic potential. The Ginzburg-Landau framework, which is generic for p-wave superfluids, is used to describe the order parameter spatial structure, or texture characterized by the l-vector both at rest and under rotation. The l-vector configuration is strongly contrained by the boundary condition due to a trap. It is found that the ground state textures exhibit spontaneous supercurrent at rest both cigar and pancake shape traps. The current direction depends on the trapping shape. Under rotation a pair of half-quantum vortex with half-winding number enters a system and is stabilized for both trap geometries. We give detailed explanation for their 3D structure. The deformations of the condensate shape are seen with increasing the rotation speed, which is tightly connected with the underlying vortex formation where the condensates are depressed in the vortex core.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑