费米子对凝聚体的形成动力学。

Formation dynamics of a fermion pair condensate.

作者信息

Zwierlein M W, Schunck C H, Stan C A, Raupach S M F, Ketterle W

机构信息

Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

出版信息

Phys Rev Lett. 2005 May 13;94(18):180401. doi: 10.1103/PhysRevLett.94.180401. Epub 2005 May 9.

DOI:10.1103/PhysRevLett.94.180401

PMID:15904346

Abstract

The dynamics of pair condensate formation in a strongly interacting Fermi gas close to a Feshbach resonance was studied. We employed a phase-shift method in which the delayed response of the many-body system to a modulation of the interaction strength was recorded. The observable was the fraction of condensed molecules in the cloud after a rapid magnetic field ramp across the Feshbach resonance. The measured response time was slow compared to the rapid ramp, which provides final proof that the molecular condensates reflect the presence of fermion pair condensates before the ramp.

摘要

研究了接近费什巴赫共振的强相互作用费米气体中配对凝聚形成的动力学。我们采用了一种相移方法，其中记录了多体系统对相互作用强度调制的延迟响应。可观测的量是在磁场快速扫过费什巴赫共振后云团中凝聚分子的分数。与快速扫过相比，测量到的响应时间较慢，这提供了最终证据，证明分子凝聚在扫过之前反映了费米子对凝聚的存在。