Closed-Cycle Magnetic Cryostat with a tuneable open cavity for spectroscopy applications

具有可调谐开腔的闭环磁性低温恒温器，适用于光谱应用

• 批准号: 455536591
• 金额: --
• 依托单位: Carl von Ossietzky Universität Oldenburg
• 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/455536591?language=en
• 关键词: Closed; Cycle; Magnetic; Cryostat; tuneable

The new Closed-Cycle Cryostat, which combines highly spatially resolved free-space spectroscopy at sample temperatures between 4 K and 300 K and at magnetic fields reaching 9 T is the central equipment of this proposal. This cryostat will have an exposed role in the research activities of the Quantum Materials group at the University of Oldenburg. It will be essential for exploring the optical- and magneto-optical properties of novel quantum materials, TMDC monolayers and van-der-Waals heterostructures, as well as light-matter coupled hybrid systems. One of the central research activities of the group is the investigation of effects evolving in the regime of strong light-matter coupling between light- and matter in optical microcavities. In such coupled light-matter systems, exciton-polaritons evolve as hybrid excitations. The physics of polaritons is a research area of high contemporary relevance, as it has a direct application relevance (novel coherent light sources) and furthermore is of strong fundamental importance, e.g. in the investigation of collective excitations and phase transitions. In order to optimize and investigate quantum materials for their applications in cavity quantum electrodynamics experiments, a measurement system is required, which enables highly spatially resolved free space spectroscopy down to cryogenic temperatures. The cryostat needs to provide large magnetic fields, and the possibility to set up a so-called open cavity. It is in particular the latter, which demands a suppression of nearly all vibrations in the system. As a central piece of equipment of the quantum materials research group, it will open the door for a variety of collaborations within the university of Oldenburg and beyond.

新的闭合循环低温恒温器结合了高空间分辨率的自由空间光谱，样品温度在4K到300K之间，磁场达到9T，是这一提议的核心设备。这个低温恒温器将在奥尔登堡大学量子材料小组的研究活动中发挥重要作用。这对于探索新型量子材料、TMDC单分子膜和van der-Waals异质结以及光-物质耦合混合体系的光学和磁光性质具有重要意义。该小组的中心研究活动之一是调查在光学微腔中光和物质之间的强光-物质耦合机制中演变的效应。在这种耦合的光-物质系统中，激子-极化子以混合激发的形式演化。极化子物理学是一个具有很高当代意义的研究领域，因为它具有直接的应用意义(新型相干光源)，而且具有很强的基础性重要性，例如在集体激发和相变的研究中。为了优化和研究量子材料在腔量子电动力学实验中的应用，需要一种测量系统，使高空间分辨率的自由空间光谱能够精确到低温。低温恒温器需要提供很大的磁场，并有可能建立一个所谓的开放腔。尤其是后者，它需要抑制系统中几乎所有的振动。作为量子材料研究小组的核心设备，它将为奥尔登堡大学内外的各种合作打开大门。