中国科学院合肥物质科学研究院强磁场科学中心坐落于安徽省合肥市风景秀丽的科学岛，2008年4月30日经中国科学院批准成立，依托中国科学院合肥物质科学研究院管理（科发人教字〔2008〕133号），其前身是2005年12月20日成立的“合肥强磁场科学技术研究中心”。中心目标：发展... 更多简介 +
稳态强磁场实验装置（Steady High Magnetic Field Facility，简称SHMFF）是国家发改委支持的“十一五”国家重大科技基础设施。SHMFF法人单位是中国科学院合肥物质科学研究院，共建单位是中国科学技术大学。各项任务以中国科学院强磁场科学中心为依托... 更多简介 +
强磁场中心邀请了美国加州大学河滨分校助理教授崔永涛访问中心并作学术报告，欢迎大家参加，请感兴趣的老师同学相互转告！
时间：
地点：磁体装备大厅203会议室
报告题目：Visualizing Emergent Interface Electronic States in Quantum Materials
报告摘要：
Low dimensional systems, such as atomically thin materials and material interfaces, offer a rich ground to discover new types of electronic states. Spatially resolved electrical probes provide direct access to these states on the mesoscopic scale, complementing conventional transport techniques. In this talk, I will present two comprehensive studies on 2D electronic states employing Microwave Impedance Microscopy (MIM), a scanning probe technique that senses materials’ capacitance and conductivity on the nanoscale.
The first study investigates domain walls in a unique all-in-all-out magnetic insulator, Nd2Ir2O7. Through a combined study of MIM, transport, and X-ray micro-diffraction, we conclusively show that metallic states emerge at the magnetic domain walls when the all-in-all-out magnetic order forms with a concomitant metal-insulator transition occurring in the bulk. This represents a new type of interface electronic states in a both chemically and structurally homogeneous material.
In the second part, we use MIM to examine the edge conduction in several 2D topological systems, including the quantum Hall (QH) effect in graphene, the quantum spin Hall (QSH) effect in HgTe quantum wells and monolayer WTe2, and the quantum anomalous Hall (QAH) effect in magnetic TI films. Correlating spatial conductivity profiles with transport measurement provides valuable insights into the underlying physics involved, which is essential to establish the mesoscopic picture for the edge conduction in such systems.
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