Urgent replacement of dilution refrigerators primary pumps

我们正在申请设备补助金，以便用阿尔卡特销售的新设计的干式泵替换我们稀释制冷机的现有泵系统。热尔韦团队绝对需要这个紧急的替代品来继续他们对5/2分数量子霍尔态的研究，这是迄今为止最有希望的非阿贝尔任意子概念验证的候选者。 这项研究是在朗讯科技公司（现为普林斯顿大学的洛伦·菲佛博士）生产的最好的半导体异质结构中进行的。2008年，我们与Das Sarma合作，证明了5/2态或间隙的内在结构不能用当前最先进的数值研究来解释。我们现在正在提取5/2 π H态的自旋极化，结合魏茨曼和哈佛小组对分数电荷的e*=e/4电荷测量，这个测量可以确定5/2态的非阿贝尔性质。为了我们的成功，需要NSERC的紧急援助来更换我们的稀释制冷机主泵，这些泵一直存在问题，以至于我们无法获得今年5/2状态的新数据。

We are requesting an equipment grant to replace the current pumping system of our dilution refrigerators with newly designed dry pumps sold by Alcatel. This urgent replacement is absolutely needed for Gervais team to continue their research on the 5/2 fractional quantum Hall state, which is by far the most promising candidate for a proof-of-concept of the non-abelian anyons. This study is carried out in the very best semiconductor heterostructure available, grown at Lucent Technologies (Dr. Loren Pfeiffer, now at Princeton). In 2008, we have shown, in collaboration with Das Sarma, that the intrinsic structure of the 5/2-state, or gap, cannot be accounted for by current state-of-the-art numerical studies. We are now in the process to extract the spin polarization of the 5/2 FQH state, a measurement which, in conjunction with the e*=e/4 charge measurement of the fractional charge by the Weizmann and Harvard group, could nail down the non-abelian nature of the 5/2 state. For us to succeed, urgent assistance is needed from NSERC for the replacement of our dilution refrigerator main pumps which have been so problematic that we were unable to obtain new data on the 5/2 state this year.