Cryofree Dilution Refrigerator System

该小组的负责人是拓扑绝缘体和超导体领域的领先研究人员，他最近从大坂搬到了科隆。该小组的一个重要的新方向是通过利用纳米器件来追求“马约拉纳费米子”的新物理。马约拉纳费米子是一种奇异的准粒子，有望出现在拓扑超导体中，它们的奇特性质有望为实现可扩展的量子计算机提供关键。纳米器件的测量，以澄清马约拉纳费米子的性质，需要超低温低至10 mK和低噪声的环境，这可以通过适当使用低温稀释制冷机来实现。该集团目前使用的是2014年在大坂购买并转移到科隆的无冷冻稀释冰箱。这台现有的机器为建立超低温低噪声实验所需的专业知识做出了巨大贡献，但目前可用的机器时间严重短缺，这已成为该集团开展的项目进展的一大障碍因素。计划中的仪器是必要的，以解决这个问题，建立一个具有国际竞争力的研究工作在科隆马约拉纳费米子。

The head of the group is a leading researcher in the field of topological insulators and superconductors, who recently moved from Osaka to Cologne. An important new direction of the group is to pursue the novel physics of “Majorana fermions” by making use of nanodevices. Majorana fermions are exotic quasiparticles expected to appear in topological superconductors, and their peculiar properties are expected to provide a key to realizing a scalable quantum computer. The measurements of the nanodevices to clarify the nature of Majorana fermions require ultra-low temperature down to 10 mK and a low-noise environment, which can be realized by a suitable use of cryofree dilution refrigerators. The group is now using one cryofree dilution refrigerator, which was purchased in Osaka in 2014 and was transferred to Cologne. This existing machine has contributed greatly to the establishment of the necessary expertise in ultra-low-temperature lownoise experiments, but currently there is a significant shortage of the available machine time, which has become a big hindrance factor for the progress of the projects carried out in the group. The planned instrumentation is necessary for solving this problem to establish an internationally competitive research efforts on Majorana fermions in Cologne.