时 间：2019年5月8日（周三）下午15：00

地 点：海韵教学楼504

主 讲 人：张学锋 研究员

研究方向：理论凝聚态物理

张学锋，博士生导师。2011年在中科院理论物理所获得博士学位，之后先后在德国凯泽斯劳腾理工大学，马克斯普朗克复杂系统物理所从事博士后研究。主要通过量子蒙特卡洛数值模拟方法研究阻挫强关联系统中的新奇量子相，以及相关的拓扑激发与拓扑相变。

摘要：Weanalyzed the repulsive particles in the frustrated optical lattice. For the triangular lattice, we find two co-order exist phases:supersolidand ordered metals. Both behave like fluid but also keep crystal structure. After introducing the spatial anisotropy, the bosonic domain walls are excited. Such topological defects can continuously change the crystal structure, so that the exotic incommensuratesupersolidis observed.Similar phenomena can also be found in thekagomeoptical lattice. When choosing cylindrical boundary condition, we found a novel edge liquid phase with fractional charges (spinons) linked by quantum strings (effective gauge field). In the strong coupling limit, we obtained the effective lattice gauge field theory which shows easy-plane NCCP1 form...