标题： 简并费米气体在光阱中的参数冷却 显示英文标题

标题： Parametric cooling of a degenerate Fermi gas in an optical trap

摘要： 我们展示了一种在交叉光束光学偶极子陷阱中冷却简并费米气体的新技术，其中可以通过调节非谐波陷阱频率的刚度，选择性地将高能原子从陷阱中移除。 我们测量了冷却效果与参数调制频率和振幅的依赖关系。 结果发现，轴向陷阱势中的大非谐性可以生成具有各向异性能量分布的简并费米气体，其中云团在轴向方向的能量可以降低到基态值。 显示英文摘要

摘要： We demonstrate a novel technique for cooling a degenerate Fermi gas in a crossed-beam optical dipole trap, where high-energy atoms can be selectively removed from the trap by modulating the stiffness of the trapping potential with anharmonic trapping frequencies. We measure the dependence of the cooling effect on the frequency and amplitude of the parametric modulations. It is found that the large anharmonicity along the axial trapping potential allows to generate a degenerate Fermi gas with anisotropic energy distribution, in which the cloud energy in the axial direction can be reduced to the ground state value.