报告人：Shiwei Zhang (张世伟), Professor, College of William and Mary 报告时间：12月09日下午4：00 报告地点：郑裕彤讲堂（理学院报告厅） 报告题目：Quantum simulations the old-fashioned way: towards ab initio many-body calculations 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.
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