香港大学-中国科学院大学 青年物理学者论坛
HKU-UCAS young physicist forum
本论坛由香港大学-中国科学院大学理论与计算物理联合研究所香港和北京分部共同承办。旨在促进青年物理学者互相的交流和讨论。不同于寻常的短平快形式的科学报告，我们主要集中于更为系统、全方位、由浅入深地讲解当前物理的各个前沿方向。报告人主要是目前活跃于科研一线的年轻学者。
This forum is hosted by the HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong and Beijing. It aims to promote interchanges and discussions among young physicists. Different from ordinary scientific reports in the short, simple and quick form, we mainly focus on explaining and introducing various frontier directions of current physics in a more systematic, all-round way and from the shallower to the deeper. The speakers are mainly young scholars who are currently active in the front line of scientific research.
2nd
forum（第二期）
报告人简介
张栩，2019年于南开大学物理学院获得理学学士学位，2019-2020年于北京中科院物理所任研究助理，2020年至今于香港大学物理系就读PhD。研究领域是凝聚态物理，近年研究兴趣集中在魔角二维材料的强关联效应、符号代数衰减的量子蒙特卡洛系统、拓扑贡献的非线性反常霍尔效应的研究中。
Xu
Zhang achieved his bachelor’s degree in Nankai University in 2019, worked as a
research assistant in IOP from 2019 to 2020, and study as a PhD student in the
University of Hong Kong from 2020 to now. His research interest focuses on
condensed matter physics, especially strong correlation effects in magic angle
2D material, polynomial decay sign problem for fermion quantum Monte Carlo and
nonlinear anomalous hall effect contributed by band topology.
报告内容、时间和地点：Zoom会议（https://hku.zoom.us/j/4505499841）
1. 魔角石墨烯 (11.23, 2pm KKLG107, HKU) [slide]
1.1 石墨烯的能带理论
1.2 转角石墨烯的BM模型
1.3 魔角石墨烯的强关联效应
2. 动量空间的量子蒙特卡洛 (11.30, 2pm, KKLG107, HKU) [slide]
2.1 写在动量空间的量子蒙卡
2.2 符号问题与符号边界理论
2.3
在二维平带系统中的应用
Talk outline, time and venue: Zoom Meeting（https://hku.zoom.us/j/4505499841）
1. Magic
angle twisted bilayer graphene (MATBG) (11.23, 2pm KKLG107, HKU) [slide]
1.1 ‘G’ in TBG
1.2 BM model for TBG
1.3 Strong correlation in MATBG
2. Quantum Monte Carlo (QMC) in momentum space (11.30, 2pm KKLG107, HKU) [slide]
2.1 Write down QMC in momentum space
2.2 Sign problem and sign bounds theory
2.3 QMC for 2D flat bands systems