30mK-Ultra-High-Vacuum Scanning Tunneling Microscope with rotatable magnetic field vector

伍珀塔尔大学计划购买一台用于扫描隧道显微镜(STM)和光谱学(STS)的高分辨率设备，用于研究新型量子材料的电子结构。该器件应在30 mK的基本温度下运行，以便进入仅在极低温度下出现的基态，并实现约30微eV的最高能量分辨率。对于样品和隧道尖端的磁性操作，该装置应配备一个矢量磁铁，使其能够在平行和垂直于样品表面的样品磁通密度下施加几特斯拉的磁场。此外，该装置应配备超高真空(UHV)系统，在该系统中可以制备样品和尖端，而不会造成污染。从超高真空系统到扫描隧道显微镜的样品和尖端的传输必须能够在超高真空内进行。该装置包括一个由被动和主动减振元件组成的系统，用于将装置与实验室建筑的振动解耦。该装置的具体项目主要涉及非传统超导体和拓扑材料的研究。它们依赖于申请人在最近完成的ERC Consolidator Grant中的初步工作。

A high-resolution device for scanning tunneling microscopy (STM) and spectroscopy (STS) is intended to be purchased at the University of Wuppertal for investigating the electronic structure of novel quantum materials. The device should perform at a base temperature of 30 mK in order to gain access to ground states which occur only at very low temperatures, and in order to achieve a highest possible energy resolution of about 30 µeV. For magnetic manipulation of the samples and the tunneling tips, the device should be equipped with a vector magnet which allows to apply at the sample magnetic flux densities of several Tesla both parallel and perpendicular to the sample's surface. Furthermore, the device should be equipped with an ultra-high-vacuum (UHV) system, in which samples and tips can be prepared without contamination. The transfer of samples and tips from the UHV system to the scanning tunneling microscope has to be possible within the UHV. The device includes a system of passive and active damping elements for decoupling the device from vibrations of the laboratory building.Specific projects with this device primarily concern the research on unconventional superconductors and topological materials. They rely on preliminary work of the applicant within a recently concluded ERC Consolidator Grant.