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

doi:10.1088/1674-1056/ad1b46

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.

Keywords: Bose—Einstein condensate atomic interaction Bloch oscillations

Received: 21 October 2023
Revised: 31 December 2023
Accepted manuscript online: 05 January 2024

PACS:	03.75.Lm	(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
	03.75.Mn	(Multicomponent condensates; spinor condensates)
	05.45.Yv	(Solitons)

Fund: 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).

Corresponding Authors: Ai-Xia Zhang, Ju-Kui Xue
E-mail: zhangax@nwnu.edu.cn;xuejk@nwnu.edu.cn

Cite this article:

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 2024 Chin. Phys. B 33 040305

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

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