报告人：张进 博士后 (美国爱荷华大学)

时 间：2021年1月2日 (周六) 上午9:00

地 点：腾讯会议号 561 794 293（无密码）

摘要：

Analog quantum simulations of lattice gauge theory are a promising direction for solving interesting problems in high energy physics. We start from the classical O(2) model with a chemical potential, map it to a two-species Bose-Hubbard model, and discuss the experimental measurement of the conformal criticality in the corresponding cold-atom quantum simulator. In the discrete dual space of compact variables, we derive a Hamiltonian formulation for the (1+1)-dimensional Abelian Higgs model that is manifestly gauge invariant. Discrete Maxwell equations are obtained naturally after integrating out the compact variables. The Hamiltonian formulation of the Polyakov loop can be obtained by the same method, which makes it possible to study this order parameter for the confinement/deconfinement phase transition experimentally. The corresponding quantum simulator is an asymmetric multi-leg ladder of atoms trapped in optical lattices and interacting with Rydberg-dressed interactions, where the required quadratic attractive interactions can be realized. The finite size scaling of the energy gap created by the insertion of a Polyakov loop can be obtained accurately by choosing spin truncations (the number of legs in the ladder) properly, which are cross-checked by tensor renormalization group calculations and Monte Carlo simulations. The method can be easily applied to Abelian models in higher dimensions and non-Abelian models.

简历：

张进博士目前为美国爱荷华大学博士后，2013年本科毕业于中国科学技术大学物理系，2019年获得美国加州大学河滨分校物理学博士学位，之前曾是美国马萨诸塞大学阿默斯特分校博士后。研究方向为格点规范场论的量子模拟，量子动力学，量子相变，已在PRL,PRD,PRA等期刊发表多篇论文。

联系方式：yangfan@bit.edu.cn

邀请人：杨帆 教授

网 址：/

承办单位：7003全讯入口、先进光电量子结构设计与测量教育部重点实验室