Rapid sympathetic cooling to Fermi degeneracy on a chip

被引：72

作者：

Aubin, S. ^{[1
]}

Myrskog, S. ^{[1
]}

Extavour, M. H. T. ^{[1
]}

LeBlanc, L. J. ^{[1
]}

McKay, D. ^{[1
]}

Stummer, A. ^{[1
]}

Thywissen, J. H. ^{[1
]}

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

来源：

NATURE PHYSICS | 2006年 / 2卷 / 06期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

D O I：

10.1038/nphys309

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutral fermions present new opportunities for testing models of many-body quantum systems, realizing precision atom interferometry, producing ultra-cold molecules, and investigating fundamental forces. However, since they were first observed(1), quantum degenerate Fermi gases ( DFGs) have continued to be challenging to produce, and have been realized in only a handful of laboratories(2-10). In this letter, we report the production of a DFG using a simple apparatus based on a microfabricated magnetic trap. Similar approaches applied to Bose-Einstein condensation of Rb-87 ( refs 11,12) have accelerated evaporative cooling and eliminated the need for multiple vacuum chambers. We demonstrate sympathetic cooling for the first time in a microtrap, and cool K-40 to Fermi degeneracy in just six seconds-faster than has been possible in conventional magnetic traps. To understand our sympathetic cooling trajectory, we measure the temperature dependence of the K-40-Rb-87 cross-section and observe its Ramsauer-Townsend reduction.

引用

页码：384 / 387

页数：4