领物课堂 | 石墨烯的七十二变

牛津仪器纳米科学部 致力于为基础科学研究，尤其是低温强磁场环境下的物理现象研究提供支持。为了给用户提供全方位的服务，特此推出‘领物课堂’系列在线科研课程。

我们特别邀请到了美国加州大学伯克利分校物理系的博士后陈国瑞作为该系列课程的第一期讲师带来题为“石墨烯的七十二变”的报告。

陈博士将以石墨烯为例，重点介绍通过多种实验手段来调控石墨烯中电子的行为，进而在石墨烯体系中实现了多种有趣的物理现象。课程中还会描述如何从单电子物理出发实现了石墨烯的能带折叠和能隙打开，进而实现强关联物理、超导物理和拓扑物理现象。欢迎大家和我们一起来“领物”石墨烯的丰富物理知识！

时间：2020年5月26日 上午10:00-11:00

主讲人：陈国瑞

主讲内容：通过多种实验手段来调控石墨烯中电子的行为，进而在石墨烯体系中实现了多种有趣的物理现象。

报名方式：点击下方报名按钮报名，席位有限先到先得。听课链接将通过短信和邮箱发送，请保证信息准确性。

注意事项：本期课程将通过腾讯会议同步开课，届时可选择合适渠道参加课程。

报告摘要：

In this talk, we will take graphene as an example to show how we tune the electronic properties of graphene and study different physics varying from single-particle physics, to strongly correlated physics and topological physics. In particular, we will start from the band engineering of graphene on hBN moire superlattice^[1]. Then we will discuss a general route to engineer strongly correlated physics in two-dimensional moiré superlattices, and show the experimental realization of a tunable Mott insulator in the ABC stacked trilayer graphene (TLG)/hBN moiré superlattice^[2]. The moiré superlattice in TLG/hBN heterostructures leads to narrow electronic minibands and allows for the observation of gate-tunable Mott insulator states at 1/4 and 1/2 fillings. Based on the trilayer graphene system, interesting signatures of superconductivity are observed at low temperatures near the 1/4 filling Mott insulating state^[3]. By simply tuning the gate voltages, a topological Chern insulator with Chern number C = 2 and ferromagnetism are experimentally observed in the non-trivial band in trilayer graphene system, which makes it possible to study Mott, superconductivity and topological physics in one system^[4].

参考文献：

[1] Guorui Chen et al, Emergence of tertiary Dirac points in graphene moiré superlattices, Nano Letters, 17 (6), 3576–3581. (2017)

[2] Guorui Chen et al, Evidence of a gate-tunable Mott insulator in a trilayer graphene moiré superlattice, Nature Physics, 15, 237-241. (2019)

[3] Guorui Chen, Aaron L. Sharpe et al, Signatures of tunable superconductivity in a trilayer graphene moiré superlattice, Nature 572, 215-219. (2019)

[4] Guorui Chen et al, Tunable correlated Chern insulator and ferromagnetism in trilayer graphene/boron nitride moiré superlattice, Nature accepted. arXiv:1905.06535 (2019).

主讲人介绍

 

陈国瑞

2010年本科毕业于山东大学物理与微电子学院，2016年博士毕业于复旦大学物理系（导师张远波教授），2017年至今为美国加州大学伯克利分校物理系博士后（Prof. Feng Wang课题组）。研究兴趣主要在高质量二维材料及其范德瓦尔异质结，尤其是石墨烯的强关联和拓扑效应的量子输运。近年来在Nature, Nature Physics, Nature Materials, Nature Nanotechnology, PRL和Nano Letters等杂志期刊发表十多篇文章。同时担任Nature, Science, NanoLetters等杂志的审稿人。