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

该项目结合了RWTH Aachen大学的II.物理研究所和位于Forschungszentum Jülich的Peter-Grünberg Institute 3(PGI-3)的主要专业知识，建立了一个全球独一无二的仪器，特别是支持卓越多国ML4Q的目标。这将是第一个在低于1K的温度下工作的四尖端扫描隧道显微镜。我们的目标是在超高真空中工作在0.1K的温度下，另外在每个尖端提供3D磁场矢量场和高达30 GHz的高频电压。这涉及到在原位制备的纳米结构内的Majorana零模的探测和光谱以及第一次量子传输实验，最终目的是实现强健操作的Majorana量子比特。这种量子比特的组装是卓越星系团ML4Q的核心承诺之一。因此，该文书将对该专题组的成功作出重要贡献。此外，这种新型仪器还将提供多种其他类型的实验选择，如《研究补充》中所述。虽然物理研究所为该项目贡献了其在低于1K温度和高频下扫描隧道显微镜的长期专业知识，但PGI-3是有关建立四尖扫描隧道显微镜的全球领导小组。

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.