Journal
SCIENCE
Volume 343, Issue 6167, Pages 157-160Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1244059
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [FOR 801]
- DFG excellence cluster The Hamburg Centre for Ultrafast Imaging - Structure, Dynamics, and Control of Matter on the Atomic Scale
- European Research Council AdG QUAGATUA
- Spanish Ministerio de Ciencia e Innovacion [FIS2008-00784]
- European Union
- ICREA Funding Source: Custom
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Collective behavior in many-body systems is the origin of many fascinating phenomena in nature, ranging from the formation of clouds to magnetic properties of solids. We report on the observation of collective spin dynamics in an ultracold Fermi sea with large spin. As a key result, we observed long-lived and large-amplitude coherent spin oscillations driven by local spin interactions. At ultralow temperatures, Pauli blocking stabilizes the collective behavior, and the Fermi sea behaves as a single entity in spin space. With increasing temperature, we observed a stronger damping associated with particle-hole excitations. Unexpectedly, we found a high-density regime where excited spin configurations are collisionally stabilized. Our results reveal the intriguing interplay between microscopic processes either stimulating or suppressing collective effects in a fermionic many-body system.
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