报告摘要：
Understanding and predicting the properties of quantum matter remains one of the grand challenges in science. Major efforts have been invested to develop methods which are both sufficiently accurate and capable of reaching realistic system sizes. I will describe recent progress in developing a quantum Monte Carlo framework for many-body simulations. We have determined aspects of the ground state in several models where previously the fermion sign problem had prohibited simulations, such as spin-density wave and itinerant ferromagnetism in Hubbard-like models, and properties of the typological phase in an interacting Haldane model. Such simulations can provide exciting new synergy with the so-called "optical lattice emulators," which aim to "simulate" the models by experiments with cold atoms. I will also discuss the applications of our method to ab initio electronic structure calculations in real materials.

报告人简介：
 张世伟教授1988年毕业于中国科学技术大学物理学专业,1993年于Cornell大学获得物理学博士学位。张教授于1994-1995年在Los Alamos National Laboratory从事博士后研究工作,1996 年加入College of William and Mary,目前是该校物理系教授。张教授曾应邀先后在不同国际学术会议、高等院校及研究所等处做过50多次学术报告。张教授是国际计算凝聚态物理领域的知名专家,特别是在费米系统的量子蒙特卡洛方法的开拓方面做出了开创性的工作 。由于他在该领域的突出贡献,张世伟教授被选为American Physical Society (APS) Fellow (2009).