He3-Cryostat with superconducting magnet

带超导磁体的 He3 低温恒温器

• 批准号: 451544120
• 金额: --
• 依托单位: Julius-Maximilians-Universität Würzburg
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/451544120?language=en
• 关键词: He3; Cryostat; superconducting; magnet

We request funding for a He3-cooled cryostat with a superconducting magnet for the integration of a home-built scanning tunneling microscope. In order to meet the scientific goals specified below we aim for a sample temperature < 500 mK. Low mechanical noise is required for reliable operation of the scanning tunneling microscope. The integration in an already existing ultra-high vacuum system requires CF-compatible flanges. The cryostat will be used for reaching the following scientific goals: (i) The investigation of potential topological superconductors and (ii) the characterization of electronic states of pure and (magnetically) doped topological insulators. The new system will enable us to achieve better insight into the above-mentioned material systems. We will design and assemble a low-temperature scanning tunneling microscope with a base sample temperature between 350 mK bis 500 mK, thereby enhancing the energy resolution by about a factor of 2,5–3 in comparison to microscopes already in use in our research group. In the context of (i) the requested setup will be enable us to access sample systems the superconducting properties of which could not be investigated so far because of their very low critical temperature. Furthermore, the much better energy resolution will allow for a better separation between potential Majorana states and other, competing effects, such as Shiba and Caroli-de Gennes-Matricon states. Regarding (ii) the enhanced energy resolution will allow for a better understanding of the Landau level life time in topological insulators where we hope to unravel the relevant scattering properties.

我们要求资助一个氦3冷却的低温恒温器与超导磁体的集成自制的扫描隧道显微镜。 为了满足以下指定的科学目标，我们的目标是样品温度< 500 mK。 低机械噪声是扫描隧道显微镜可靠运行的必要条件。 集成到现有的超高真空系统中需要CF兼容的法兰。低温恒温器将用于实现以下科学目标：（一）潜在拓扑超导体的研究和（二）纯和（磁）掺杂拓扑绝缘体的电子状态的表征。新系统将使我们能够更好地了解上述材料系统。我们将设计和组装一个低温扫描隧道显微镜，其基本样品温度在350 mK至500 mK之间，从而与我们研究小组已经使用的显微镜相比，将能量分辨率提高约2，5 -3倍。在（i）的上下文中，所要求的设置将使我们能够访问样品系统，其超导特性由于其非常低的临界温度而迄今无法研究。 此外，更好的能量分辨率将允许更好地分离潜在的马约拉纳状态和其他竞争效应，如Shiba和Caroli-de Gennes-Matricon状态。关于（ii）增强的能量分辨率将允许更好地理解拓扑绝缘体中的朗道能级寿命，我们希望解开相关的散射特性。