Dry dilution refrigerator with vector magnet

我们申请了一台干式3He/4He稀释制冷机，制冷功率为250微瓦，基温为10mK，并配备了一个超导矢量磁体，允许x/y/z方向的磁场为1/3/6特斯拉。该仪器将用于更深入地了解外延Al/InAs基约瑟夫森结纳米阵列和扩展的准二维薄膜中超导中的自旋-轨道相互作用效应。我们将研究新的磁电效应、手性和拓扑相，并展望其在量子电子电路中的应用前景。除了标准输运实验，我们的实验工具将是新实现的动态电感测量技术，它将系统地应用于两个研究方向：1)研究基于外延Al/InAs异质结的自旋-轨道相互作用引起的超流响应、自发超流以及相应的磁化模式：在这里，我们将结合上述技术来揭示在垂直和面内组合磁场中预期的非常规流动模式。垂直场分量调谐系统中的受挫，面内场与自旋-轨道相互作用共同影响Andreev束缚态的自旋织构。2)在具有强自旋轨道相互作用的二维奇异超导体中寻找非常规超导电性和磁电效应：我们想要利用电感测量来研究Al/InAs(110)和几种特别有趣的化合物金属中的磁电各向异性和可能的非常规配对：1)几层NbSe2，2)薄的超导BiI/Ni双层薄膜，3)外延Au/V双层薄膜。所有材料系统的共同之处是超导性与极强的自旋-轨道相互作用的组合，以及相应的非传统和拓扑超导的前景。

We apply for a dry 3He/4He-dilution refrigerator with a cooling power of 250 microwatt at 100 mK, a base temperature of 10 mK, and equipped with a superconducting vector magnet allowing for magnetic fields of 1/3/6 Tesla in the x/y/z-directions.The instrument will be used to gain a deeper understanding of spin-orbit interaction effects in super¬conductivity both in epitaxial Al/InAs-based nanopatterned arrays of Josephson junc-tions and in extended quasi-two-dimensional films. We will investigate novel magneto-electric effects, chiral, and topological phases with the prospect of applications in quantum electronic circuits. Besides standard transport experiments, our experimental tool will be the newly implemented technique of kinetic inductance measurements, which will be systematically applied in two research directions:1) Investigation of spin-orbit interaction-induced supercurrent response, spontaneous supercurrents, and the corresponding magnetization patterns in devices based on epitaxial Al/InAs heterostructures: Here we will combine the above techniques mentioned in order to uncover the expected unconventional flow patterns in combined perpendicular and in-plane magnetic fields. The perpendicular field component tunes the frustration in the system, the in-plane field affects together with the spin-orbit interaction the spin-texture of the Andreev bound states. We expect states with exotic magnetic order resulting from the interaction between the spontaneous ring currents that emerge from spin-orbit interaction in absence of time-reversal symmetry and that can be tuned with the strength and direction of the in-plane magnetic field.2) Search for unconventional superconductivity and magnetoelectric effects in two-dimensional exotic superconductors with strong spin-orbit interaction: We want to employ inductance measurements in order to investigate magneto-electric anisotropy and possible unconventional pairing in Al/InAs(110) and several particularly interesting compound metals: 1) few-layer NbSe2, 2) thin super¬conducting Bi/Ni-bilayers, 3) epitaxial Au/V-bilayers. Common to all material systems is the combinations of supercon-ductivity with extremely strong spin-orbit interaction, and the corresponding prospects for unconventional and topological superconductivity.