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Cooper pairing in the insulating valence band in iron-based superconductors

作者:点击次数:更新时间:2016年10月26日

报告人:陈伟强 副教授 (南方科技大学)

报告时间:2016.10.28(周五)下午4:00

报告地点:LE523

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报告摘要:Conventional Cooper pairing arises from attractive interaction of electrons in the metallic bands. A recent experiment on Co-doped LiFeAs shows superconductivity in the insulating valence band, which is evolved from a metallic hole band upon doping. Here we examine this phenomenon by studying superconductivity in a three-orbital Hamiltonian relevant to the doped LiFeAs. We show explicitly that Cooper pairing of the insulating hole band requires a finite pairing interaction strength. For strong coupling, the superconductivity in the hole band is robust against the sink of the hole band below the Fermi level. Our theory predicts a substantial upward shift of the chemical potential in the superconducting transition for Co-doped LiFeAs.

报告人简介:陈伟强 南方科技大学物理系副教授,2000年获清华大学物理系学士,2006年获清华大学物理系博士学位,2006年至2008年,香港大学物理系博士后研究员,2008年至2011年,香港大学物理系助理教授,深圳市“孔雀计划”高层次人才入选者。主要研究领域为强关联电子系统、高温超导电性、拓扑绝缘体、超冷原子系统,在物理顶级刊物Phys. Rev. Lett.,Phys. Rev. A发表多篇论文。

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