酉费米气体中对关联的大振幅动力学
Large Amplitude Dynamics of the Pairing Correlations in a Unitary Fermi Gas
摘要：
幺正费米气体具有令人惊讶的丰富的配对场大振幅模式谱，这与仅涉及减少的自由度集的形式主义（例如量子流体力学或朗道-金兹伯格描述）中的描述不符。这些模式非常慢，振荡频率远低于配对间隙，这使得它们通过准粒子激发的阻尼非常无效。在原子阱中，这些模式自然地与密度振荡耦合，并且原子云的相应振荡是超流费米系统中新型集体模式的一个例子。它们具有比压缩集体流体动力振荡更低的频率，具有非球形动量分布，并且可以由散射长度的快速时间变化来激发。
英文摘要：
A unitary Fermi gas has a surprisingly rich spectrum of large amplitude modes of the pairing field alone, which defies a description within a formalism involving only a reduced set of degrees of freedom, such as quantum hydrodynamics or a Landau-Ginzburg-like description. These modes are very slow, with oscillation frequencies well below the pairing gap, which makes their damping through quasiparticle excitations quite ineffective. In atomic traps these modes couple naturally with the density oscillations, and the corresponding oscillations of the atomic cloud are an example of a new type of collective mode in superfluid Fermi systems. They have lower frequencies than the compressional collective hydrodynamic oscillations, have a non-spherical momentum distribution, and could be excited by a quick time variation of the scattering length.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
