Dry dilution refrigerator with vector magnet

带矢量磁铁的干稀释冰箱

• 批准号: 464847925
• 金额: --
• 依托单位: Universität Regensburg
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/464847925?language=en
• 关键词: Dry; dilution; refrigerator; vector; magnet

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.

我们申请了一台干式3 He/4 He稀释制冷机，在100 mK时的制冷功率为250微瓦，基础温度为10 mK，并配备了一个超导矢量磁体，允许在x/y/z方向上产生1/3/6特斯拉的磁场。该仪器将用于更深入地了解外延Al/InAs-基于约瑟夫森结的纳米图案阵列和扩展的准二维薄膜。我们将探讨新颖的磁电效应、手征性与拓扑相位，并前景其在量子电子电路中的应用。 除了标准的输运实验外，我们的实验工具将是新实现的动力学电感测量技术，该技术将系统地应用于两个研究方向：1）研究基于外延Al/InAs异质结构的器件中自旋-轨道相互作用诱导的超电流响应、自发超电流以及相应的磁化模式：在这里，我们将联合收割机上述技术，以揭示预期的非常规流动模式，在联合垂直和在-平面磁场垂直场分量对系统中的阻挫起调谐作用，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。我们期望具有奇异磁序的状态是由自发环电流之间的相互作用产生的，这些自发环电流是在没有时间反演对称性的情况下从自旋轨道相互作用中出现的，并且可以通过平面内磁场的强度和方向进行调谐。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性和磁电效应： 我们希望采用电感测量来研究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）少层NbSe 2，2）薄超导Bi/Ni双层，3）外延Au/V双层。所有材料系统的共同点是超导电性与极强的自旋-轨道相互作用的结合，以及相应的非常规和拓扑超导性的前景。