| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Realization of $^{87}$Rb Bose–Einstein Condensates in Higher Bands of a Hexagonal Boron-Nitride Optical Lattice |
| Jin-Yu Liu1,2, Xiao-Qiong Wang3*, and Zhi-Fang Xu2,3* |
1Department of Physics, Harbin Institute of Technology, Harbin 150001, China
2Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
3Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
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| Cite this article: |
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Jin-Yu Liu, Xiao-Qiong Wang, and Zhi-Fang Xu 2023 Chin. Phys. Lett. 40 086701 |
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Abstract Ultracold neutral atoms in higher bands of an optical lattice provide a natural avenue to emulate orbital physics in solid state materials. Here, we report the realization of $^{87}$Rb Bose–Einstein condensates in the fourth and seventh Bloch bands of a hexagonal boron-nitride optical lattice, exhibiting remarkably long coherence time through active cooling. Using band mapping spectroscopy, we observe that atoms condensed at the energy minimum of $\varGamma$ point ($K_{1}$ and $K_{2}$ points) in the fourth (seventh) band as sharp Bragg peaks. The lifetime for the condensate in the fourth (seventh) band is about 57.6 (4.8) ms, and the phase coherence of atoms in the fourth band persists for a long time larger than 110 ms. Our work thus offers great promise for studying unconventional bosonic superfluidity of neutral atoms in higher bands of optical lattices.
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Received: 18 April 2023
Editors' Suggestion
Published: 21 July 2023
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| PACS: |
67.85.-d
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(Ultracold gases, trapped gases)
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37.10.Jk
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(Atoms in optical lattices)
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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67.85.De
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(Dynamic properties of condensates; excitations, and superfluid flow)
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