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A correlated wavefunction approach to unconventional superconductor

发布日期:2023-10-23 作者: 编辑:冯蓉蓉 来源:兰州理论物理中心

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。

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