Superexchange-mediated magnetization dynamics with ultracold alkaline-earth atoms in an optical lattice

• 来源期刊: 中国物理B（英文版）
• 关键词: alkaline-earth atoms spin dynamics spin-exchange superexchange
• 年，卷（期）: 2017,（4）
• 页码范围: 344-350
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/4/046702

摘要

Superexchange and inter-orbital spin-exchange interactions are key ingredients for understanding (orbital) quantum magnetism in strongly correlated systems and have been realized in ultracold atomic gases.Here we study the spin dynamics of ultracold alkaline-earth atoms in an optical lattice when the two exchange interactions coexist.In the superexchange interaction dominating regime,we find that the time-resolved spin imbalance shows a remarkable modulated oscillation,which can be attributed to the interplay between local and nonlocal quantum mechanical exchange mechanisms.Moreover,the filling of the long-lived excited atoms affects the collapse and revival of the magnetization dynamics.These observations can be realized in state-dependent optical lattices combined with the state-of-the-art advances in optical lattice clock spectroscopy.