Superconducting resonators for high field quantum materials characterisation

用于高场量子材料表征的超导谐振器

• 批准号: 2892112
• 金额: --
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892112
• 关键词: Superconducting; resonators; field; quantum; materials

The goal of this studentship is to develop superconducting resonators as a probe for investigating coupled exotic magnetic materials. The resonator must operate under high magnetic fields to access phenomena such as quantum criticality and frustrated magnetism in the coupled material. Using superconducting resonators for indirect materials characterisation is well-established but has previously relied on "traditional" materials that cease to superconduct in high magnetic fields; the materials we wish to characterise are often only interesting under such a high field. At Cardiff University, we have pioneered the use of superconducting boron-doped nanocrystalline diamond (BNCD) for device applications and previous Cardiff-led research has shown that BNCD can withstand sufficiently high fields to make it an ideal material for this purpose. We have also recently recently shown a prototype device demonstrating that BNCD has the properties required for an enhanced shift to its resonant frequency when coupled to a material of interest. Within this project, the student will design, simulate, fabricate and measure superconducting resonators with starting parameters determined from our proof-of-concept prototype, and determine the predicted shift in the resonant frequency under a magnetic field when specific materials are brought close to the device. The simulations will benchmark experimental applications of the device measured using a dilution fridge with a base temperature of 10mK and magnetic fields up to 8T.

本研究的目的是开发超导共振器作为研究耦合奇异磁性材料的探针。谐振器必须在高磁场下工作，以获得耦合材料中的量子临界性和受抑磁性等现象。使用超导谐振器进行间接材料表征是成熟的，但以前依赖于在高磁场中停止超导的“传统”材料;我们希望研究的材料通常只在这样的高磁场下才感兴趣。在卡迪夫大学，我们率先将超导掺硼纳米晶金刚石（BNCD）用于设备应用，以前由卡迪夫领导的研究表明，BNCD可以承受足够高的电场，使其成为实现这一目的的理想材料。我们最近还展示了一个原型设备，证明BNCD具有当耦合到感兴趣的材料时增强其谐振频率的偏移所需的特性。在这个项目中，学生将设计，模拟，制造和测量超导谐振器，其起始参数由我们的概念验证原型确定，并确定当特定材料靠近设备时，在磁场下谐振频率的预测偏移。这些模拟将对该设备的实验应用进行基准测试，该设备使用基础温度为10 mK的稀释冰箱和高达8 T的磁场进行测量。