Coherence of nonlinear Bloch dynamics of Bose—Einstein condensates in deep optical lattices

doi:10.1088/1674-1056/ad1b46

中国物理B ›› 2024, Vol. 33 ›› Issue (4): 40305-040305.doi: 10.1088/1674-1056/ad1b46

Coherence of nonlinear Bloch dynamics of Bose—Einstein condensates in deep optical lattices

Ai-Xia Zhang(张爱霞)^†, Wei Zhang(张薇), Jie Wang(王杰), Xiao-Wen Hu(胡潇文), Lai-Lai Mi(米来来), and Ju-Kui Xue(薛具奎)^‡

College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China

收稿日期:2023-10-21 修回日期:2023-12-31 接受日期:2024-01-05 出版日期:2024-03-19 发布日期:2024-03-27
通讯作者: Ai-Xia Zhang, Ju-Kui Xue E-mail:zhangax@nwnu.edu.cn;xuejk@nwnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12264045, 12164042, 11764039, 11847304, and 11865014), the Natural Science Foundation of Gansu Province (Grant No. 17JR5RA07620JR5RA526), the Scientific Research Project of Gansu Higher Education (Grant No. 2016A-005), the Innovation Capability Enhancement Project of Gansu Higher Education (Grant Nos. 2020A- 146 and 2019A-014), and the Creation of Science and Technology of Northwest Normal University (Grant No. NWNULKQN-18-33).

Coherence of nonlinear Bloch dynamics of Bose—Einstein condensates in deep optical lattices

Ai-Xia Zhang(张爱霞)^†, Wei Zhang(张薇), Jie Wang(王杰), Xiao-Wen Hu(胡潇文), Lai-Lai Mi(米来来), and Ju-Kui Xue(薛具奎)^‡

College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2023-10-21 Revised:2023-12-31 Accepted:2024-01-05 Online:2024-03-19 Published:2024-03-27
Contact: Ai-Xia Zhang, Ju-Kui Xue E-mail:zhangax@nwnu.edu.cn;xuejk@nwnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12264045, 12164042, 11764039, 11847304, and 11865014), the Natural Science Foundation of Gansu Province (Grant No. 17JR5RA07620JR5RA526), the Scientific Research Project of Gansu Higher Education (Grant No. 2016A-005), the Innovation Capability Enhancement Project of Gansu Higher Education (Grant Nos. 2020A- 146 and 2019A-014), and the Creation of Science and Technology of Northwest Normal University (Grant No. NWNULKQN-18-33).

摘要/Abstract

摘要： Atomic interaction leads to dephasing and damping of Bloch oscillations (BOs) in optical lattices, which limits observation and applications of BOs. How to obtain persistent BOs is particularly important. Here, the nonlinear Bloch dynamics of the Bose—Einstein condensate with two-body and three-body interactions in deep optical lattices is studied. The damping rate induced by interactions is obtained. The damping induced by two-body interaction plays a dominant role, while the damping induced by three-body interaction is weak. However, when the two-body and three-body interactions satisfy a threshold, long-lived coherent BOs are observed. Furthermore, the Bloch dynamics with periodical modulation of linear force is studied. The frequencies of linear force corresponding to resonance and pseudoresonance are obtained, and rich dynamical phenomena, i.e., stable and strong BOs, drifting and dispersion of wave packet, are predicted. The controllable Bloch dynamics is provided with the periodic modulation of the linear force.

关键词: Bose—Einstein condensate, atomic interaction, Bloch oscillations

Abstract: Atomic interaction leads to dephasing and damping of Bloch oscillations (BOs) in optical lattices, which limits observation and applications of BOs. How to obtain persistent BOs is particularly important. Here, the nonlinear Bloch dynamics of the Bose—Einstein condensate with two-body and three-body interactions in deep optical lattices is studied. The damping rate induced by interactions is obtained. The damping induced by two-body interaction plays a dominant role, while the damping induced by three-body interaction is weak. However, when the two-body and three-body interactions satisfy a threshold, long-lived coherent BOs are observed. Furthermore, the Bloch dynamics with periodical modulation of linear force is studied. The frequencies of linear force corresponding to resonance and pseudoresonance are obtained, and rich dynamical phenomena, i.e., stable and strong BOs, drifting and dispersion of wave packet, are predicted. The controllable Bloch dynamics is provided with the periodic modulation of the linear force.

Key words: Bose—Einstein condensate, atomic interaction, Bloch oscillations

中图分类号: (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

03.75.Lm

03.75.Mn (Multicomponent condensates; spinor condensates) 05.45.Yv (Solitons)

Ai-Xia Zhang(张爱霞), Wei Zhang(张薇), Jie Wang(王杰), Xiao-Wen Hu(胡潇文), Lai-Lai Mi(米来来), and Ju-Kui Xue(薛具奎). Coherence of nonlinear Bloch dynamics of Bose—Einstein condensates in deep optical lattices[J]. 中国物理B, 2024, 33(4): 40305-040305.

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Coherence of nonlinear Bloch dynamics of Bose—Einstein condensates in deep optical lattices

Coherence of nonlinear Bloch dynamics of Bose—Einstein condensates in deep optical lattices

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