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Superexchange-mediated magnetization dynamics with ultracold alkaline-earth atoms in an optical lattice |
| Shaobing Zhu(朱少兵)1,2, Jun Qian(钱军)1, Yuzhu Wang(王育竹)1 |
1 Key Laboratory for Quantum Optics and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract 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.
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Received: 06 December 2016
Revised: 24 January 2017
Accepted manuscript online:
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PACS:
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67.85.Lm
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(Degenerate Fermi gases)
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34.50.Cx
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(Elastic; ultracold collisions)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301504). |
Corresponding Authors:
Yuzhu Wang
E-mail: yzwang@mail.shcnc.ac.cn
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Cite this article:
Shaobing Zhu(朱少兵), Jun Qian(钱军), Yuzhu Wang(王育竹) Superexchange-mediated magnetization dynamics with ultracold alkaline-earth atoms in an optical lattice 2017 Chin. Phys. B 26 046702
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