Wright M J, Riedl S, Altmeyer A, Kohstall C, Guajardo E R Sánchez, Denschlag J Hecker, Grimm R
Institut für Experimentalphysik und Forschungszentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
Phys Rev Lett. 2007 Oct 12;99(15):150403. doi: 10.1103/PhysRevLett.99.150403.
We report on experimental studies on the collective behavior of a strongly interacting Fermi gas with tunable interactions and variable temperature. A scissors mode excitation in an elliptical trap is used to characterize the dynamics of the quantum gas in terms of hydrodynamic or near-collisionless behavior. We obtain a crossover phase diagram for collisional properties, showing a large region where a nonsuperfluid strongly interacting gas shows hydrodynamic behavior. In a narrow interaction regime on the BCS side of the crossover, we find a novel temperature-dependent damping peak, suggesting a relation to the superfluid phase transition.
我们报告了关于具有可调相互作用和可变温度的强相互作用费米气体集体行为的实验研究。椭圆阱中的剪刀模式激发被用于根据流体动力学或近无碰撞行为来表征量子气体的动力学。我们获得了碰撞性质的交叉相图，显示出一个大区域，其中非超流强相互作用气体表现出流体动力学行为。在交叉点BCS侧的一个狭窄相互作用区域中，我们发现了一个新的与温度相关的阻尼峰，这表明它与超流相变有关。
