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报告题目：Interaction- and Geometry-Driven Quantum Phases in Superlattice and Twisted Bilayer Bose Systems

报告嘉宾：张超，安徽师范大学 教授

报告时间：2025年9月16日 10:00

报告地点：吉林大学中心校区唐敖庆楼B区521报告厅

主持人：米文慧

报告摘要

　　Ultracold atoms in optical lattices provide a versatile platform to study strongly correlated quantum matter, where both lattice geometry and interactions can be precisely controlled. In this talk, I will first discuss dipolar bosons in twisted bilayers. We show that the twist angle acts as a new degree of freedom: at very small angles the system supports paired superfluid and supersolid phases; a slight increase destabilizes these paired states in favor of phase separation between checkerboard solids and superfluids; and at larger twist angles, the density follows the moiré pattern, forming insulating islands surrounded by superfluid. In the second part, I will turn to the Bose-Hubbard model on a honeycomb superlattice. Here, the competition between onsite interaction and lattice modulation produces superfluid, uniform Mott insulator, and density-imbalanced Mott insulator phases, with continuous superfluid–insulator transitions and a robust finite-temperature superfluid regime. These two studies together highlight how geometry and interactions can be combined to engineer novel quantum states of bosons, offering concrete predictions for forthcoming cold-atom experiments.

嘉宾简介

张超，安徽师范大学物理与电子信息学院教授。2018年12月获得美国俄克拉荷马大学物理学博士学位，后在德国萨尔大学，美国麻省大学阿默斯特分校从事博士后研究员工作。长期从事基于蒙特卡洛的方法对强相互作用的多粒子体系的研究，具有扎实的研究基础和丰富的经验。截至目前已经取得了较为丰富的研究成果，在Physical Review X、Physical Review Letter、Physical Review B、Physical Review A、New Journal of Physics等国际知名期刊发表论文29篇，一作或者通讯25篇。获得Simons基金会与意大利国际理论物理中心（ICTP）访问教授资助（2026-2027）。

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