CAREER: Heat Capacity Study on Low Dimensional Electronic Systems at Low Temperature

该CAREER项目致力于在温度低至~ 10 mK的情况下对Kosterlitz无（KT）型超导转变和超导体-绝缘体转变（SIT）进行同时热容和输运测量。该项目包括设计和制造最先进的低温纳米热量计。用SQUID读出，量热计的预期灵敏度预期足以检测在10 mK下约1纳克的金属（例如铜）的电子热容贡献，对应于覆盖直径约1 mm的单层膜。将在连续流动He低温恒温器和稀释冰箱中研究超薄AuIn、Ta和Bi薄膜的超导转变。预计开发的实验技术也将影响其他2D系统的热力学性质的研究，如费米液体，近藤系统和半导体界面中的电子，为该领域的终身贡献和教育提供基础。该项目涉及对本科生和研究生进行工业标准微细加工技术和各种凝聚态技术方面的教育和培训。以计算机为基础获取和分析大型数据集需要在信息技术前沿进行培训。这些机会将帮助学生发展面向未来的科学和技术观点。 PI将开发一门新的课程，向理科专业的学生和来自各个科学学科的研究生教授各种最先进设备的原理和应用。本课程将让学生以个案研究、文献检索及海报展示的形式积极参与课堂活动。外联工作包括创建一个综合网站，其中包含与研究和教育活动、K12和社区学院讲座、演示和实验室图尔斯参观有关的教育材料。***

This CAREER project addresses simultaneous heat capacity and transport measurements on Kosterlitz-Thouless (KT) type superconducting transitions and Superconductor-Insulator Transi-tions (SIT) at temperatures down to ~10mK. The project includes design and fabrication of a state-of-the-art low temperature nano-calorimeter. With a SQUID readout, the expected sensitiv-ity of the calorimeter is expected to be sufficient to detect the electronic heat capacity contribu-tion from a metal (copper, for example) of ~1 nanogram at 10mK, corresponding to a monolayer film covering an area of ~1mm in diameter. Superconducting transitions of ultrathin AuIn, Ta, and Bi films will be investigated in a continuous flow He cryostat, and a dilution refrigerator. Experimental techniques to be developed are expected to also impact the study of thermody-namic properties of other 2D systems such as Fermi liquids, Kondo systems, and electrons in semiconductor interfaces, providing a foundation for a lifetime of contribution and education in this field. The project involves education and training of undergraduate and graduate students in industry-standard microfabrication techniques and a variety of condensed matter techniques. Computer-based acquisition and analysis of large data sets requires training at the frontier of information technology. These opportunities will help students develop future-oriented perspectives on sci-ence and technology. The PI will develop a new course to teach principles and applications of various state-of-the-art devices to science majors and graduate students from various disciplines of science. The course will offer students active participation in the class activity in the form of case study, literature search, and poster presentations. An outreach effort includes creating a comprehensive website containing educational materials related with research and educational activities, K12 and community college lectures, demonstration, and laboratory tours. ***