Time: 09:30 am (UTC/GMT+8:00, Beijing/Shanghai), Jun. 18 (Fri.), 2021

Venue: Rm M235, M Building of Institute of Physics (IOP, CAS)

Speaker: Mingpu Qin (School of Physics and Astronomy, SJTU)

Abstract:

I will first give a brief review of the 2D Hubbard model and then focus on the ground state properties of the doped 2D Hubbard model in the region relavent to cuprate superconconductor. With a collabration of different numerical many-body methods, the ground state of the 1/8 doped 2D Hubbard model was established as stripe phase. Recently, we found superconductivity is absent in the pure 2D doped Hubbard model in the strongly interacting region. I will disucss the implication of these results on the study of the mechanism of high-Tc superconductivity.

Bio:

秦明普于2008年毕业于北京航空航天大学。2013年在中国科学院物理研究所获得理学博士学位。之后在美国威廉玛丽学院从事博士后工作，2014 年至2018年同时加入Simons基金会多电子问题合作组，为附属科学家。2019年1月加入上海交通大学物理与天文学院任长聘教轨副教授。主要研究凝聚态物理中的强关联量子多体问题。兴趣在发展和改进强关联多体数值方法，包括密度矩阵重整化群，辅助场量子蒙特卡洛，张量网络态等方法。在费米子负符号问题的研究中做出了一些工作。最近重点关注二维Hubbard 模型基态性质的求解。与合作者确认了掺杂下二维 Hubbard 模型基态中的条纹相。

Next talk: Robust d-wave superconductivity in the square-lattice t-J model (Shoushu Gong, Beihang Univ.)

Invited by Prof. Long Zhang