Novel Thermal Transport Phenomena in Quantum Materials

量子材料中的新型热传输现象

• 批准号: 2317618
• 负责人: Lu Li
• 金额: $ 48.37万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-12-01 至 2026-11-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2317618&HistoricalAwards=false
• 关键词: Novel; Thermal; Transport; Phenomena; Quantum

Non-technical Abstract: Electrons carry not only electricity but also energy. This property of electrons is a powerful probe for quantum materials. Moving the electrons with heat generates electrical voltages or reveals thermal conductions in the solids. These mobile electrons may change the moving directions under a magnetic field, leading to transverse electrical voltages and thermal conductions. These novel thermal transport properties are essential to detect and probe the ground state of strongly correlated quantum materials. The research brings the potential to open the door to studying the interplay between strong-correlation effects and topology in the search for new quantum phases, novel topological phases, and new multi-functionalities for future electronics. The project also provides opportunities to train undergraduate and graduate students in the science and technology of this quantum world. By involving undergraduates in research, creating opportunities to promote the integration of women and minorities in careers in science and engineering, bringing local school students to laboratories, and communicating research to the broader public, the team brings the general public the advancements in strongly correlated materials and develops excitement, awareness, and interest in the field of quantum science and condensed matter physics. Technical Abstract: The research project aims to investigate strongly correlated materials using novel thermal transport properties. Bridging the research fields of strongly correlated materials and topological quantum materials, the research team will use the thermoelectric effect and thermal Hall effect to reveal the physical origin of recently observed novel phenomena of strongly correlated materials: (1) quantum oscillations in Kondo insulators; (2) large thermal Hall effects in undoped and doped Mott insulators; (3) exotic thermal transport in quantum spin liquid; and (4) flat-bland phenomena of Kagome metals. These directions are exciting new developments in long-standing puzzles in condensed matter physics. They share the same debate about the role of the charge-neutral quasiparticles in the strongly interacted states: what carries these interesting phenomena: magnon, phonon, Bogoliubov quasiparticles, or even Majorana excitations. The research tasks will answer these questions: (1) What is the nature of the magnetic-field-driven insulator-metal-transition in Kondo insulators? (2) What causes strong Hall signals of the heat current in Mott insulating undoped cuprates? (3) Are the fundamental excitations fermionic or bosonic in Kagome quantum spin liquid? (4) What are the experimental signatures of the flat band in Kagome metals? Answers to these questions will eventually provide the big picture of the electronic and magnetic ground states of strongly correlated materials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：电子不仅具有电力，还具有能量。电子的这种特性是对量子材料的强大探针。用热移动电子会产生电压或揭示固体中的热电导。这些移动电子可能会在磁场下改变移动方向，从而导致横向电压和热导电。 这些新型的热运输特性对于检测和探测密切相关的量子材料的基态至关重要。这项研究带来了在寻找新的量子阶段，新颖的拓扑阶段以及未来电子产品的新的多功能功能时，可以为研究强相关效应和拓扑之间的相互作用打开大门。该项目还提供了培训这个量子世界科学和技术的本科生和研究生的机会。通过让大学生参与研究，创造了机会来促进妇女和少数民族在科学和工程领域的职业，将当地学校的学生带入实验室，并向更广泛的公众传达研究，从而为公众提供了强烈关联的材料中的进步，并发展了量子，对量子科学和凝结物质的兴奋，明智和兴趣。技术摘要：该研究项目旨在使用新型的热运输特性研究密切相关的材料。研究小组将桥接密切相关的材料和拓扑量子材料的研究领域，将使用热电效应和热厅效应来揭示最近观察到的新型新型材料的新现象的物理来源：（1）（1）近核绝缘体中的量子振荡； （2）在未星和掺杂的莫特绝缘子中的大厅效应； （3）量子自旋液体中的外来热传输； （4）kagome金属的扁平现象。这些方向是凝聚态物理学长期难题的令人兴奋的新发展。他们在强烈相互作用的状态中，关于电荷中性准颗粒的作用的辩论相同：带有这些有趣现象的是什么：镁，声子，bogoliubov quasiparticles，甚至是主要的激发。研究任务将回答以下问题：（1）在近托绝缘子中，磁场驱动的绝缘子 - 金属转变的性质是什么？ （2）是什么原因导致莫特绝缘不居库层中热电流的强大信号？ （3）Kagome量子自旋液体中的基本激发费用或骨气是吗？ （4）kagome金属中平面带的实验特征是什么？这些问题的答案最终将提供密切相关材料的电子和磁接地状态的全局。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准通过评估来支持的。

项目成果

Quantum oscillations evidence for topological bands in kagome metal ScV 6 Sn 6

Kagome 金属 ScV 6 Sn 6 拓扑带的量子振荡证据

• DOI: 10.1088/1361-648x/ad2803
• 发表时间: 2024
• 期刊: Journal of Physics: Condensed Matter
• 作者: Zheng, Guoxin;Zhu, Yuan;Mozaffari, Shirin;Mao, Ning;Chen, Kuan-Wen;Jenkins, Kaila;Zhang, Dechen;Chan, Aaron;Arachchige, Hasitha W. Suriya;Madhogaria, Richa P.
• 通讯作者: Madhogaria, Richa P.