报告题目：Pressure induced superconductor-insulator-transition

报 告 人：Aviad Frydman，Bar Ilan University, Israel

报告时间：2024-03-22 10:00

报告地点：理科楼C302

报告摘要：The Superconductor Insulator Transition (SIT) in 2D layers and thin films has been a topic of great interest for the past few decades. While much progress has been made in the field, both theoretically and experimentally, there are still important open questions, such as the possible existence of an intermediate anomalous metal phase and the nature of the insulating phase.

Several tuning parameters have been used in the past to drive the transition, including thickness, disorder, magnetic field, chemical composition etc. I will present a new tuning parameter, i.e., hydrostatic pressure, to gain further information on the electric properties close to the transition, and especially on the insulating and metallic phases. For this purpose, we grow thin films of amorphous Indium Oxide directly on a diamond which is part of a high pressure Diamond Anvil Cell, thus enabling us to apply pressure of up to ~20 GPa on a thin disordered film. Starting with an insulating film we find that initially, up to ~1.5GPa, pressure induces a transition to a superconducting state with growing critical temperature. However, applying higher pressure causes a suppression of superconductivity and drives the film back to an insulating state through an apparent metallic phase. Interestingly, the electronic properties of the pressure-induced insulator are different than those of the insulator in ambient conditions. I will discuss the implications of these results on the nature of superconductivity in highly disordered 2D superconductors and on the presence of an anomalous metal state.

报告人简介：

Aviad Frydman教授于1996年在以色列耶路撒冷希伯来大学(Hebrew University of Jerusalem)取得物理学博士学位，1996年至1999年在美国加州大学圣地亚哥分校(UCSD)从事博士后研究，1999年加入巴伊兰大学，曾作为访问学者在美国耶鲁大学（2005-2006年）、法国国家科学研究中心（CNRS, 2012-2013年）、英国剑桥大学（2021年）从事研究工作，2013年晋升正教授。担任过法国奈尔研究所(Neel Institute)的荣誉主席(Chair of excellence)(2015-2017年)，2022年起担任巴伊兰大学物理系系主任(Department chair)，2023年起担任法国巴黎萨克雷大学(Paris-Saclay University)约翰兰伯特学者（John D’lambert fellow）。目前发表文章超过85篇，包括Nat. Phys. 3篇，Nat. Commun. 2篇，Phys. Rev. Lett. 7篇，做邀请报告超过60次。