Department of Physics, Bar Ilan University, Israel

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 is a Physics professor in Bar Ilan University in Israel. He graduated from the Hebrew University of Jerusalem with Highest Distinction. He performed his post-doctoral research at the University of California, San Diego, working with Robert C. Dynes. In 1999 he obtained an academic position at Bar-Ilan University where he became a full Professor in 2013. During 2006 and 2007 he was a visiting professor in Yale University. From 2012 to 2013 he served as a visiting professor in the Institut Néel, France, and in 2021 to 2022 he was a visiting professor at Cambridge University in the UK. During 2015 to 2017 he served as a Chair of excellence, LANEF, Grenoble. Since 2022 he is serving as the Chair of the Physics Department at Bar-Ilan University.

报告地点：M253 会议室

联系人：朱北沂 / 8264-9927