Quantum Matter Seminar: Novel quantum fluctuation effects in condensed matter

曾长淦

中国科学技术大学

报告时间：2024年9月9日（周一）下午15:30

报告地点：紫金港校区段永平教学楼2号楼212报告厅

报告摘要

Quantum fluctuations, resulting from quantum zero-point energy, are known to induce a variety of physical phenomena, such as spontaneous emission, the Casimir effect, and the Lamb shift. In this presentation, I will discuss our recent advancements in the study of quantum fluctuations within condensed matter systems. I will introduce the development of a scanning Casimir force microscope and highlight the magnetic-filed tunning of the Casimir force from attraction to repulsion in ferrofluids using this microscope [1]. Following this, I will explore a striking supercurrent drag effect observed between graphene and a superconducting LaAlO3/SrTiO3 heterointerface, originating from the interaction between substantially enhanced dynamical quantum fluctuations of the superconducting phases in Josephson junction arrays and the normal electrons [2]. Finally, I will present some preliminary results on the enhancement of superconductivity through quantum fluctuations within a dark cavity [3].

Reference

[1] Y. Zhang et al., Nat. Phys. 20, 1282 (2024).

[2] R. Tao et al., Nat. Phys. 19, 372 (2023).

[3] Z. Wang et al., Unpublished.

报告人简介：

曾长淦，中国科学技术大学讲席教授，教育部“长江学者”特聘教授。1997年和2002年分别获中国科学技术大学理学学士和理学博士学位，2002-2007年在美国田纳西大学从事博士后研究，2007年被聘为中国科学技术大学物理学院和合肥微尺度物质科学国家研究中心教授。长期从事低维凝聚态物理实验研究，在量子材料电子态和量子输运特性的设计与调控方面取得了系列进展。承担包括国家重点研发计划项目、中科院战略先导专项项目、基金委重点项目在内的多项重要科研任务。