期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.220401
关键词
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资金
- IFRAF institute
- Triangle de la Physique
- ANR-ProQuP project
- DGA
- FCT scholarship [SFRH/BD/74352/2010]
- Marie Curie program of the European Union
- Fundação para a Ciência e a Tecnologia [SFRH/BD/74352/2010] Funding Source: FCT
We have modulated the density of a trapped Bose-Einstein condensate by changing the trap stiffness, thereby modulating the speed of sound. We observe the creation of correlated excitations with equal and opposite momenta, and show that for a well-defined modulation frequency, the frequency of the excitations is half that of the trap modulation frequency.
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