Achieving a BCS transition in an atomic Fermi gas

被引:91
作者
Carr, LD
Shlyapnikov, GV
Castin, Y
机构
[1] Ecole Normale Super, Lab Kastler Brossel, F-75231 Paris, France
[2] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands
[3] Kurchatov Inst, Russian Res Ctr, Moscow 123182, Russia
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.92.150404
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We consider a gas of cold fermionic atoms having two spin components with interactions characterized by their s-wave scattering length a. At positive scattering length the atoms form weakly bound bosonic molecules which can be evaporatively cooled to undergo Bose-Einstein condensation, whereas at negative scattering length BCS pairing can take place. It is shown that, by adiabatically tuning the scattering length a from positive to negative values, one may transform the molecular Bose-Einstein condensate into a highly degenerate atomic Fermi gas, with the ratio of temperature to Fermi temperature T/T(F)similar to10(-2). The corresponding critical final value of k(F)\a\, which leads to the BCS transition, is found to be about one-half, where k(F) is the Fermi momentum.
引用
收藏
页码:150404 / 1
页数:4
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