Coexistence of superconductivity with partially filled stripes in the Hubbard model

讲演择要：
Combining the complementary capabilities of two of the most powerful modern computational methods, we find superconductivity in both the electron- and hole-doped regimes of the two-dimensional Hubbard model (with next nearest neighbor hopping). In the electron-doped regime, superconductivity is weaker and is accompanied by antiferromagnetic Néel correlations at low doping. The strong superconductivity on the hole-doped side coexists with stripe order, which persists into the overdoped region with weaker hole density modulation. These stripe orders, neither filled as in the pure Hubbard model (no next nearest neighbor hopping) nor half-filled as seen in previous state-of-the-art calculations, vary in fillings between 0.6 and 0.8. The resolution of the tiny energy scales separating competing orders requires exceedingly high accuracy combined with averaging and extrapolating with a wide range of system sizes and boundary conditions. These results validate the applicability of this iconic model for describing cuprate high-Tc superconductivity.

讲演人简介：
秦明普于2008年本科结业于北京航空航天年夜学。2013年正在中国迷信院物理研究所得到理学博士学位。之后正在美国威廉玛丽学院从事博士后事情，2014 年至2018年同时参加Simons基金会多电子问题互助组。2019年1月参加上海交通年夜学物理与天文学院任长聘教轨副传授。首要研究凝聚态物理中的强联系关系量子多体问题。致力于成长以及革新准确的强联系关系多体要领，包含密度矩阵重整化群，帮助场量子蒙特卡洛，张量收集态等要领。正在费米子负符号问题以及密度矩阵重整化群的推广方面中做出了一些事情。比来重点存眷二维Hubbard 模子基态的求解，与互助者发明二维纯Hubbard模子的基态为条纹相，不超导序；有次近邻跃迁的Hubbard模子的基态与铜基超导能定性吻合。