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Disorder induced multifractal superconductivity in monolayer niobium dichalcogenides

创建于2018年12月19日 星期三作者 : 科研办 浏览量 :

主讲人:陈曦,清华大学教授

间:2018122013:00

点:物电澳门新普京下载A219

联系人:廖蕾

 

讲座摘要:The interplay between disorder and superconductivity is a subtle and fascinating phenomenon in quantum many body physics. The conventional superconductors are insensitive to dilute nonmagnetic impurities, known as the Anderson’s theorem. Destruction of superconductivity and even superconductor-insulator transitions occur in the regime of strong disorder. Hence disorder-enhanced superconductivity is rare and has only been observed in some alloys or granular states. Because of the entanglement of various effects, the mechanism of enhancement is still under debate. Here we report well-controlled disorder effect in the recently discovered monolayer NbSe2 superconductor. The superconducting transition temperatures of NbSe2 monolayers are substantially increased by disorder. Realistic theoretical modeling shows that the unusual enhancement possibly arises from the multifractality of electron wave functions. This work provides the first experimental evidence of the multifractal superconducting state.

 

主讲人简介:陈曦,1993年本科毕业于清华大学物理系,2004年于美国Cornell大学物理系获博士学位,2006年起在清华大学物理系任助理教授,2010起任教授。2010年获国家杰出青年科学基金。2011年获国家自然科学二等奖和求是杰出科技成就集体奖。研究成果分别入选2010年中国高等学校十大科技进展和中国科学十大进展,以及2011年中国高等学校十大科技进展。研究领域是实验凝聚态物理。近期主要学术贡献包括:利用扫描隧道显微镜进行单自旋探测、发现单原子层薄膜的超导电性、发现拓扑绝缘体表面态中背散射缺失的实验证据、拓扑绝缘体表面态朗道量子化的观测、FeSe超导体能隙节点和二重对称性的观测、发现KFe2Se2超导体中的相分离等。

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