学术报告：Emergent phenomena in correlated oxides close to metal-insulator transition
报告人：陈航晖（Assistant Professor 上海纽约大学）
时间：6月12日(周三)，10:00
地点：田家炳楼南203室
邀请人：董帅
Correlated oxides exhibit a wide range of exotic phenomena from metal-insulator transition, colossal magnetoresistance to high-temperature superconductivity. In this talk, we focus on one class of correlated oxides that are close to metal-insulator transition. Upon external perturbations, new phenomena emerge in those correlated oxides. Specifically, we show that: i) a magnetic transition can simultaneously induce an orbital-selective insulator-metal transition in rock-salt ordered oxides A2BB'O6 where B is a non-magnetic ion and B' a magnetic ion with a d3 electronic configuration (Ru5+ and Os5+). The orbital selectivity originates from geometrical frustration of a face-centered-cubic lattice on which the magnetic ions B' reside; ii) in (SrRuO3)1/(SrTiO3)N superlattices, the Ru magnetic anisotropy is changedfrom two-fold along <001> axis (N<3) to eight fold along <111> axis (N>=3). The reorientation of the Ru magnetic easy axis is due to a new orbital ordering which significantly tunes the underlying spin-orbit interaction.
Bio: 上海纽约大学助理教授。本科毕业于北京大学，博士毕业于耶鲁大学，曾在哥伦比亚大学从事博士后研究。研究方向为第一性原理建模和设计复杂结构材料，尤其是过度金属氧化物和其异质结。在PRL, Adv. Mater., Nano Lett., PRB等期刊发表论文十余篇。