Observation of Josephson effect in 23Na spinor Bose-Einstein condensates

doi:10.1088/1674-1056/ada42f

中国物理B ›› 2025, Vol. 34 ›› Issue (3): 33701-033701.doi: 10.1088/1674-1056/ada42f

Observation of Josephson effect in ²³Na spinor Bose-Einstein condensates

Yong Qin(秦永)¹, Xin Wang(王鑫)¹, Jun Jian(蹇君)¹, Wenliang Liu(刘文良)^1,2, Jizhou Wu(武寄洲)^1,2,†, Yuqing Li(李玉清)^1,2, Jie Ma(马杰)^1,2, Liantuan Xiao(肖连团)^1,2, and Suotang Jia(贾锁堂)^1,2

1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

收稿日期:2024-10-09 修回日期:2024-12-27 接受日期:2024-12-31 发布日期:2025-03-15
通讯作者: Jizhou Wu E-mail:wujz@sxu.edu.cn
基金资助:
Project supported by the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302103), the National Natural Science Foundation of China (Grant Nos. 62325505, 62020106014, 62175140, 62475138, 92165106, and 12104276), and the Shanxi Province Graduate Student Research Innovation Project (Grant No. 2024KY105).

Observation of Josephson effect in ²³Na spinor Bose-Einstein condensates

1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Received:2024-10-09 Revised:2024-12-27 Accepted:2024-12-31 Published:2025-03-15
Contact: Jizhou Wu E-mail:wujz@sxu.edu.cn
Supported by:
Project supported by the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302103), the National Natural Science Foundation of China (Grant Nos. 62325505, 62020106014, 62175140, 62475138, 92165106, and 12104276), and the Shanxi Province Graduate Student Research Innovation Project (Grant No. 2024KY105).

摘要/Abstract

摘要： The Josephson effect, an important quantum supercurrent phenomenon, has been extensively studied in superconductors and superfluids. In this paper, we investigate the rich physics of one-dimensional Josephson junctions in a red-detuned optical lattice with sodium (Na) quantum gas. A one-dimensional Josephson array is formed by setting up an optical lattice using a red-detuned laser. By characterizing the dependence of Josephson oscillations of the lattice depth, we experimentally demonstrate the Josephson current. The lattice depth is controlled by altering the lattice power, and our observations are consistent with theoretical predictions. These findings offer valuable insights into quantum coherent transport and the intricate dynamics inherent to superfluidity.

关键词: Josephson junction, Josephson critical current, optical lattice, Bose-Einstein condensates

Abstract: The Josephson effect, an important quantum supercurrent phenomenon, has been extensively studied in superconductors and superfluids. In this paper, we investigate the rich physics of one-dimensional Josephson junctions in a red-detuned optical lattice with sodium (Na) quantum gas. A one-dimensional Josephson array is formed by setting up an optical lattice using a red-detuned laser. By characterizing the dependence of Josephson oscillations of the lattice depth, we experimentally demonstrate the Josephson current. The lattice depth is controlled by altering the lattice power, and our observations are consistent with theoretical predictions. These findings offer valuable insights into quantum coherent transport and the intricate dynamics inherent to superfluidity.

Key words: Josephson junction, Josephson critical current, optical lattice, Bose-Einstein condensates

中图分类号: (Atoms in optical lattices)

37.10.Jk

74.50.+r (Tunneling phenomena; Josephson effects) 03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

Yong Qin(秦永), Xin Wang(王鑫), Jun Jian(蹇君), Wenliang Liu(刘文良), Jizhou Wu(武寄洲), Yuqing Li(李玉清), Jie Ma(马杰), Liantuan Xiao(肖连团), and Suotang Jia(贾锁堂). Observation of Josephson effect in ²³Na spinor Bose-Einstein condensates[J]. 中国物理B, 2025, 34(3): 33701-033701.

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Observation of Josephson effect in ²³Na spinor Bose-Einstein condensates

Observation of Josephson effect in ²³Na spinor Bose-Einstein condensates

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