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                热点链接

                学术活动

                首页学术活动

                单层、多层石墨烯中的磁关联和超导配对

                主 讲 人 :马天星      教授

                活动时间:01月09日09时30分    

                地      点 :腾讯会议 151 498 530

                讲座内容:

                Using exact quantum Monte Carlo method, we identifythe phase diagram of the half filled, the lightly doped and heavily dopedgraphene, which shows a rather rich physical properties. At half filling, thesystem is driven to a Mott insulator with antiferromagnetic long range order byincreasing interaction, and a transition from a d+id pairing to a p+ip pairingis revealed, depends on the next-nearest hoping and the electronic fillings. Wealso examine the recent novel electronic states seen in magic-angle graphenesuperlattices. From the Hubbard model on a double-layer honeycomb lattice witha rotation angle θ=1.08 , we reveal that an antiferromagnetically ordered Mottinsulator emerges beyond a critical Uc at half filling, and with a smalldoping, the pairing with d+id  symmetry dominates over other pairings atlow temperature. The effective d+id pairing interaction strongly increaseas the on-site Coulomb interaction increases, indicating that thesuperconductivity is driven by electron-electron correlation. Our non-biasednumerical results demonstrate that the twisted bilayer graphene share thesimilar superconducting mechanism of high temperature superconductors, which isa new and idea platform for further investigating the strongly correlatedphenomena.


                主讲人介绍:

                马天星,北京师范大学物理学系教授,博士研究生导师。分别于2000年7月和2005年7月在北京师范大学获得学士和博士学位。2005年8月至2010年6月先后在复旦大学、德国马普所、香港中文大学从事凝聚态物理理论方面的博士后研究,曾在美国Los Alamos国家实验室、美国加州大学←圣地亚哥分校、美国加州大学Davis分校等访问研究。2010年7月至今在北京师范大学物理学系工作。主要从事电子关联体系磁性和超导电性的研究,包括石墨烯、铁基超导体、有阻挫系统等,已在Phys. Rev. Lett.、Phys. Rev. B,Appl. Phys. Lett.等上发表60余篇学术论文,主持或完成多项国家自然科学基金面上项目、北京市委优秀人才项目、北京市自然科》学基金项目等。


                发布时间:2022-01-06 08:49:18

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                地址:河北省石家庄市南二环东路20号 邮编:050024 

                版权所有网信彩票

                冀ICP备18011017号-3

                冀公网安备 13010802000630号

                地址:河北省石家庄市南二环东路20号

                邮编:050024