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ISFF2019学术视频-1：A new chapter of semiconductors with magnetic impurities

半导体学报 yj 2019-11-15阅读量：


题   目：A new chapter of semiconductors with magnetic impurities
报告人：Tomasz Dietl
单   位：Polish Academy of Sciences
时   间：2019-10-13
地   点：中国科学院半导体研究所

报告摘要

The rise of magnetic quantum materials opens for magnetic semiconductors a new chapter  involving: (i) functionalities of spin polarized topological boundary states; (ii) magnetic proximity effects, and (iii) the control of magnetism by gating and by a number of layers in van der Waals heterostructures. Importantly, by detaching few-layer thick epitaxial films from substrates, the "lego" method can be extended to virtually any magnetic semiconductor. In this context, I will  address the question on whether it is possible to extend the functionalities of magnetic quantum materials to above room temperature. Encouraging examples of compounds in which the p-d Zener mechanism on the one hand and the superexchange on the other lead to magnetic order persisting up to high temperatures will be discussed. The issue of d0 ferromagnetism will be touched upon bringing up the case of organic semiconductors and bilayer graphene, in which spin order appears with no magnetic impurities, albeit so far only at helium temperatures. In the main body of the talk, I will discuss a superconductivity-like behavior discovered at interfaces of metals and topological materials by point-contact spectroscopy, and will show corresponding data for magnetic topological crystalline insulators serving to elucidate a possible origin of the phenomenon.


报告人简介

Professor Tomasz Dietl obtained his PhD from the Institute of Physics, Polish Academy of Sciences in Warsaw, where he is presently a head of the International Centre for Interfacing Magnetism and Superconductivity with Topological Matter "MagTop". He is also a P.I. at the Advanced Institute for Materials Research at Tohoku University in Sendai, Japan.  His current research interests are focused on the development of material systems and device concepts for nanospintronics of topological materials, ferromagnetic and antiferromagnetic semiconductors, and of hybrid metal/ semiconductor nanostructures. According to WoS, the papers he co-authored have been cited more than 20,000 times.


在线观看报告视频：https://www.koushare.com/video/videodetail/2999