题目：Manipulating the electronic structure of spin-orbit coupled 4d-/5d- correlated electrons by tailoring superlattices

报告人：D. W. Shen (沈大伟)  中国科学院上海微系统所

地点： 教十二-201

时间： 3月24日，周五，15:00-16:00

摘要：

In this talk, I will introduce how to fabricate, characterize and manipulate the electronic structure of artificial 4d-/5d- transition metal oxide epitaxial films by the combo of oxide molecular beam epitaxy (OMBE), in-situ angle-resolved photoemission spectroscopy (ARPES) and X-ray magnetic circular dichroism (XMCD) techniques. We systematically studied the evolution of the low-energy electronic structure of SrRuO3 films with thickness thinning down to a nearly two-dimensional limit in a well-controlled way. Also, we have fabricated a series of high-quality [(SrIrO3)m/(SrTiO3)]n/SrTiO3(100) superlattices using the layer-by-layer  OMBE growth method, and consequently realized the emergent interfacial magnetism and metal-insulator transition (MIT) by artificial dimensionality control of iridates. The mechanism of this MIT and the elemental specificity of magnetism were then investigated by the in-situ ARPES system and XMCD, respectively. Our results could provide a comprehensive understanding of the phase transition in this spin-orbit Mott insulator and demonstrate a potential new route to control the electronic properties of nonpolar oxide heterostructures.

个人简介：

沈大伟，中国科学院上海微系统所研究员。于2003年毕业于复旦大学物理系获理学学士学位；并于2008年6月在复旦大学物理系获理学博士学位。2008.12 - 2010.12在美国康奈尔大学物理系从事博士后研究工作。2011年1月被中国科学院上海微系统与信息技术研究所特别引进，负责设计和搭建基于同步辐射等先进光源的多手段综合原位高分辨电子结构测量线站，并利用其致力于各类功能氧化物薄膜和器件的生长、表征和性能调控研究。2011年获得全国百篇优秀博士论文奖励，2013年获得中科院卢嘉锡青年人才奖。在Nature materials、Nature communications、Physical Review Letters和Physical Review X等国际重要学术期刊上发表学术论文30余篇，它引超过800次。

欢迎老师和同学参加！