报告题目 (Title)：Thouless pumping and trapping of two-component gap solitons（两组份能隙孤子的拓扑输运和囚禁）

报告人 (Speaker)：吕昊 博士后（冲绳科学技术大学）

报告时间 (Time)：2024年9月2日(周一) 10:00-12:00

报告地点 (Place)：校本部 G404

邀请人 (Inviter)：张永平 教授

主办部门：理学院物理系

摘要 (Abstract)：

We study Thouless pumping and arresting of gap solitons in a two-component Bose gas loaded into an optical superlattice. We show that, depending on the atomic interactions and chemical potentials, the two solitons can be simultaneously pumped or trapped, but we also identify regimes where one soliton is pumped and the other arrested. These behaviors can be understood by considering an effective model of the system based on a variational approach, which reveals that the soliton width is a suitable qualifier for the observed behaviors: solitons with a larger width get transported, while solitons with a smaller width get trapped. Since these width can be controlled by tuning interactions, it should be possible to observe all behaviors experimentally.