题目：Generation, transport and detection of pure valley currents in two-dimensional heterostructures

报告人：金辰皓

               康奈尔大学卡佛里研究员

时间：2018年7月11日下午15:00

地点：国家脉冲强磁场科学中心C204

报告摘要：

Two-dimensional (2D) hexagonal materials provide a promising platform for valleytronics devices, owing to the convenient generation and manipulation of valley qubits. However, efficient generation of valley information carriers with long valley lifetime is difficult to achieve in single material due to intrinsic valley relaxation channels. Here we show that, such intrinsic limit can be overcome through combining two materials into a van der Waals heterostructure; and report both near-perfect generation efficiency of valley information carriers, as well as record-high valley lifetime. Furthermore, we demonstrate generation, transport, and spatial-temporal imaging of the valley currents in a single device, which opens up new exciting opportunities to realize novel spintronic and valleytronic applications.

参考文献：

[1] C. Jin*, J. Kim*, et al. Science360, 893-896(2018).

[2] J. Kim*, C. Jin*, et al. Science Advances Vol. 3, no. 7, e1700518 (2017).

报告人简介：

金辰皓，康奈尔大学卡佛里研究员。2008-2012年就读北京大学，获物理学士学位。2012-2017年就读加州大学伯克利分校，获物理博士学位。2017-2018年，在加州大学伯克利分校从事博士后研究。2018年至今，任康奈尔大学卡佛里研究员。主要从事凝聚态实验研究，用光学手段对低维材料以及异质结的物性进行探测，在对石墨烯、碳纳米管、黑磷、氮化硼、过渡金属硫化物及其形成的异质结中的摩尔物理和动力学做出了很多开创性的工作。已发表论文20余篇，其中第一作者或共同第一作者发表1篇Science，1篇Science Advances，3篇Nature Physics，1篇Nature Nanotechnology，1篇Advanced functional Materials。论文总引用1600余次。

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