期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.013201
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资金
- Conseil Regional d'Ile-de-France under DIM Nano-K/IFRAF
- CNRS
- Ministere de l'Enseignement Superieur et de la Recherche within CPER Contract
- Universite Sorbonne Paris Cite
- Indo-French Centre for the Promotion of Advanced Research [LORIC5404-1]
- PPKC
We report on the observation of a collective spin mode in a spinor Bose-Einstein condensate. Initially, all spins point perpendicular to the external magnetic field. The lowest energy mode consists of a sinusoidal oscillation of the local spin around its original axis, with an oscillation amplitude that linearly depends on the spatial coordinates. The frequency of the oscillation is set by the zero-point kinetic energy of the BEC. The observations are in excellent agreement with hydrodynamic equations. The observed spin mode has a universal character, independent of the atomic spin and spin-dependent contact interactions.
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