主讲人：杨帆 教授（北京理工大学）

报告题目：Possible Pair Density Wave State with a Bogoliubov Fermi Surface in a Slightly Doped Kagome Spin Liquid

时间：2022年11月23日（周三）下午15：00

腾讯会议ID：618 340 773

联系人：赵继泽

报告摘要：

It has been long proposed by P. W. Anderson that doping a quantum spin liquid (QSL) will lead to high-temperature superconductivity. This proposal, however, is delayed due to the difficulty in the search of QSL parent compound. Recently, various numerical evidences convergently point to the existence of QSL ground state in the Heisenberg model on the Kagome lattice. In this talk, we start from one of the most promising QSL state in this system, i.e. the U(1) Dirac QSL, and consider the fate of this state upon hole doping, using large scale variational Monte-Carlo calculations. Using a new variational wave function, we obtained a chiral noncentrosymmetric nematic superconducting state with 2 × 2-enlarged unit cell. Moreover, this pair density wave state possesses a finite Fermi surface for the Bogoliubov quasiparticles. We further study experimentally relevant properties of this intriguing pairing state.

Reference: Y.F.Jiang, H.Yao and FY, Phys. Rev. Lett. 127,187003 (2021).

个人简介：

杨帆，北京理工大学物理学院教授。本科毕业于武汉大学物理系，博士毕业于北京大学物理学院，之后于清华大学高等研究中心从事博士后研究。2004年加入北理工。主要研究方向为超导和强关联理论。曾长期在铜氧化物高温超导和铁基超导机理以及相关领域展开研究。近期主要研究兴趣集中在各类现实材料或者模型体系中由于电子关联所驱动的新奇超导态。在高温超导的集体激发、铁基超导配对对称性、掺杂自旋液体、魔角石墨烯超导特性、准晶超导等研究领域取得有意义的研究结果。