摘要
涡旋态的研究对理解冷原子体系超流特性有很重要的价值.文章在简要回顾涡旋态研究历史的基础上,介绍了文章作者近期在超冷极化费米气体中涡旋态的工作.通过应用平均场的方法,从理论上研究了强相互作用极化费米气中单个涡旋态的结构.发现在涡旋态核中,Andreev束缚态的填充可引起一种量子相变.这就提供了一种新颖的探测Andreev束缚态的方法,在冷原子物理中,可通过吸收成像方法来完成.进一步文章作者对涡旋态的核尺寸进行了研究,发现涡旋态的核尺寸随着体系极化程度的增加而变大.
The study of quantized vortices is very important for our understanding of the superfluid properties of cold atoms. We briefly review current progress in this field, and then describe our recent work on the vortex structure of a strongly interacting spin-polarized Fermi gas. We analyze a singly-quantized vortex in a spin-polarized Fermi gas at unitarity, based on a mean-field approach. We find that a quantum phase transition occurs due to the occupation of the Andreev-like bound states at the vortex core. This may provide us with a new way to visualize the bound states by using phase-contrast imaging in cold-atom physics. Furthermore, we investigate the core size of vortices and find that the core expands gradually as the spin polarization increases.
出处
《物理》
CAS
北大核心
2008年第3期141-143,共3页
Physics
基金
国家自然科学基金(批准号:10574080)
国家重点基础研究发展计划(批准号:2006CB921404)资助项目
