期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.185302
关键词
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资金
- National Key R&D Program of China [2018YFA0306501, 2017YFA0304204, 2016YFA0301604]
- NSFC of China [11874340, 11425417, 117740067, 11625522]
- Chinese Academy of Sciences (CAS)
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- Fundamental Research Funds for the Central Universities [WK2340000081]
- Anhui Initiative in Quantum Information Technologies
Researchers generated a large number of vortices in a fermionic superfluid and observed their annihilation dynamics and spatial distribution. The vortices were found to follow algebraic scaling laws with exponents consistent with two-dimensional universality. Simulations of the classical XY model showed good agreement between numerical and experimental behaviors.
Vortices play a leading role in many fascinating quantum phenomena. Here we generate a large number of vortices by thermally quenching a fermionic superfluid of Li-6 atoms in an oblate optical trap and study their annihilation dynamics and spatial distribution. Over a wide interaction range from the attractive to the repulsive side across the Feshbach resonance, these quasi-two-dimensional vortices are observed to follow algebraic scaling laws both in time and space, having exponents consistent with the two-dimensional universality. We further simulate the classical XY model on the square lattice by a Glauber dynamics and find good agreement between the numerical and experimental behaviors. Our work provides a direct demonstration of the universal 2D vortex dynamics.
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