主讲人：蒋坤 研究员（中国科学院物理研究所）

题目：A correlated wavefunction approach to unconventional superconductor

时间：2023年11月2日（周四）上午10：30

地点：理工楼1215

联系人：钟寅

报告摘要：

We propose a modified BCS wavefunction as the ground state of a correlated superconductor with the correlation specified between k and −k electrons in the reciprocal space. Owing to this correlation, low-energy excitations are not conventional BCS Bogoliubov quasiparticles. They display at least four poles in the Green's function and their particle-hole weights in the tunneling and photon-emission spectrum become asymmetric. The superfluid density or superfluid stiffness also deviates from the BCS predictions with finite paramagnetic terms inside the total diamagnetic response. Moreover, a d-wave correlated pairing state becomes robust against weak disorders. Hence, this state can explain many mysterious features observed in unconventional superconductors like cuprates.

个人简介：

蒋坤，2009年和2012年本科、硕士毕业于南京大学，2018年博士毕业于美国波士顿学院物理系，随后继续在波士顿学院从事博士后研究工作。2020年6月加入中国科学院物理研究所任特聘研究员。蒋坤主要从事凝聚态物理理论研究工作，主要研究电子关联和拓扑系统，尤其是非常规超导电性。