4-Tip Scanning Tunneling Microscope for Ultrahigh Vacuum Operation at 100 mK

该项目结合了II的关键专业知识。RWTH亚琛大学物理研究所和位于Forschungszentrum Jülich的Peter-Grünberg研究所3（PGI-3）将建立一个全球独特的仪器，特别是支持卓越集群ML 4 Q的目标。这将是第一个在低于1 K的温度下工作的四尖端扫描隧道显微镜。我们的目标是在低至0.1 K的温度下工作，同时在每个尖端提供3D磁矢量场和高达30 GHz的高频电压。这解决了检测和光谱学以及原位制备的纳米结构内的马约拉纳零模式的第一个量子传输实验，最终目标是实现稳健操作的马约拉纳量子比特。这种量子位的组装是卓越集群ML 4 Q的一个核心承诺。因此，该文书将对专题组的成功作出至关重要的贡献。此外，新的仪器将提供多种选择的其他类型的实验中所描述的“补充研究”。物理研究所为该项目贡献了其在亚1 K温度和高频扫描隧道显微镜方面的长期专业知识，PGI-3是一个全球领先的四尖扫描隧道显微镜组。

The project combines key expertise of the II. Institute of Physics at RWTH Aachen University and the Peter-Grünberg Institute 3 (PGI-3) at Forschungszentrum Jülich to set up a worldwide unique instrument supporting, in particular, the aims of the excellence cluster ML4Q. It will be the first four-tip scanning tunneling microscope that operates at temperatures below 1 K. We aim to work at temperatures down to 0.1 K within ultrahigh vacuum additionally providing a 3D magnetic vector field and high frequency voltages up to 30 GHz at each tip. This addresses the detection and spectroscopy as well as first quantum transport experiments of Majorana zero modes within nanostructures that are prepared in-situ with the ultimate aim to achieve robustly operating Majorana qubits. The assembly of such qubits is one central promise of the excellence cluster ML4Q. As such, the instrument will crucially contribute to the success of the cluster. The novel instrument will, moreover, offer multiple options of other types of experiments as described in the “Supplements of Research”.While the II. Institute of Physics contributes its long-term expertise of scanning tunneling microscopy at sub-1K temperatures and high frequency to the project, PGI-3 is a worldwide leading group concerning the set-up of four-tip scanning tunneling microscopes.