期刊
SCIENCE
卷 354, 期 6308, 页码 83-88出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf6689
关键词
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资金
- Ministry of Science and Technology of China [2016YFA0301601, 2016YFA0301604]
- National Natural Science Foundation of China
- CAS
- National Fundamental Research Program [2013CB922001]
- Fundamental Research Funds for the Central Universities [2030020028, 2340000034]
- Peking University Initiative Scientific Research Program
- National Natural Science Foundation of China [11574008]
- Thousand-Young-Talent Program of China
Cold atoms with laser-induced spin-orbit (SO) interactions provide a platform to explore quantum physics beyond natural conditions of solids. Here we propose and experimentally realize two-dimensional (2D) SO coupling and topological bands for a rubidium-87 degenerate gas through an optical Raman lattice, without phase-locking or fine-tuning of optical potentials. A controllable crossover between 2D and 1D SO couplings is studied, and the SO effects and nontrivial band topology are observed by measuring the atomic cloud distribution and spin texture in momentum space. Our realization of 2D SO coupling with advantages of small heating and topological stability opens a broad avenue in cold atoms to study exotic quantum phases, including topological superfluids.
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