物理与电子工程学院2019学术论坛之二十
报告题目:Unusual Current Partition Law and Conducting Topological Network in Twisted Graphene bilayer
报告人：乔振华教授（中国科技大学）
报告时间：4月28日 14:30
报告地点：行政西楼2楼物电学院会议室
摘要: The intersection of three topological zero-lines is the elementary current partition node that arises in twisted bilayer graphene due to moiré patterns of six alternating gapped AB/BA stacking regions. Unlike the partition laws of two intersecting zero-lines, we find that (i) the incoming current can be partitioned into both left-right adjacent topological channels and that (ii) the forward propagating current is nonzero. Moreover, upon applying a perpendicular electric field, we observe that electronic conducting of the topological network formed by such partition nodes is direction-dependent. Our results provide a comprehensive depiction of the electronic transport properties of a topological zero-line network and have far-reaching implications in the design of electron-beam splitters and low-power-consuming topological quantum devices.
乔振华，中国科技大学教授，博士生导师。 2005年于山西大学获物理学士学位，2009年于香港大学获博士学位，曾在美国德克萨斯大学奥斯汀分校从事研究工作。2013年入选中国科学院“百人计划”并通过择优支持。他专注于低维介观电子输运研究以及拓扑物性的研究，在石墨烯、拓扑绝缘体等领域做出了有国际影响力的工作。在Nat. Nanotech.，Nat. Commun.，Phys. Rev. Lett.，Rep. Prog. Phys.，Angew. Chem.和Nano. Lett.等国际顶级期刊发表SCI 论文 39 篇，其中4篇为ISI高被引用论文，总被引用1116次，H因子为17。
