Cryofree Dilution Refrigerator System

该小组的负责人是拓扑绝缘体和超导体领域的主要研究人员，他最近从大阪搬到了科隆。该小组的一个重要的新方向是利用纳米器件追求“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，它们的特殊性质有望为实现可扩展量子计算机提供关键。为了澄清马约拉纳费米子的性质，纳米器件的测量需要低至10 mK的超低温和低噪声环境，这可以通过适当使用无冷冻稀释冰箱来实现。该集团目前正在使用一台冷冻稀释冰箱，该冰箱于2014年在大阪购买，并转移到科隆。这台现有的机器为超低温低噪音实验所需的专业知识的建立做出了很大的贡献，但目前可用的机器时间明显不足，这已经成为阻碍小组开展项目进展的一大因素。为了在科隆建立具有国际竞争力的马约拉纳费米子研究工作，计划中的仪器是解决这一问题所必需的。

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.