2019学术论坛之二十——Unusual Current Partition Law and Conducting Topological Network in Twisted Graphene bilayer
2019-04-24 04:40   审核人:

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:428 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年入选中科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.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


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