THE FULDE–FERRELL–LARKIN–OVCHINNIKOV STATE IN A 3D FERMI GAS SUBJECTED TO A 1D PERIODIC POTENTIAL
THE FULDE–FERRELL–LARKIN–OVCHINNIKOV STATE IN A 3D FERMI GAS SUBJECTED TO A 1D PERIODIC POTENTIAL
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DOI：
10.1142/s0217984912300141
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发表时间：
2012-07
影响因子：
1.9
通讯作者：
Jeroen P. A. Devreese;S. Klimin;M. Wouters;J. Tempere
中科院分区：
文献类型：
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作者：
Jeroen P. A. Devreese;S. Klimin;M. Wouters;J. Tempere
不平衡的费米气体是否能够适应极化超流性的问题一直是深入研究的主题。极化超流体态的一个著名候选者是富尔德-费雷尔-拉金-奥夫钦尼科夫 (FFLO) 态。在一维 (1D) 费米气体中，最近发现了这种状态的间接证据，但在三维 (3D) 情况下，这种奇异状态迄今为止仍然难以捉摸。在这篇简短的综述中，我们研究了不平衡 3D 费米气体中 1D 周期性势对 FFLO 状态的影响。我们提出了系统自由能的路径积分推导，其中通过鞍点近似包含 FFLO 状态的可能性。利用自由能，构建了系统在固定化学势和固定密度下的相图，表明 FFLO 状态的稳定区域被一维势显着扩大。随后，研究了电位对FFLO配对机制的影响......
The question whether an imbalanced Fermi gas can accommodate polarized superfluidity has been the subject of intense study. One prominent candidate for a polarized superfluid state is the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state. In a one-dimensional (1D) Fermi gas, indirect evidence for this state has recently been found, but in the three-dimensional (3D) case, this exotic state has hitherto remained elusive. In this brief review, we study the influence of a 1D periodic potential on the FFLO state in an imbalanced 3D Fermi gas. We present a path-integral derivation of the free energy of the system, where the possibility of the FFLO state is included through the saddle-point approximation. Using the free energy, the phase diagram of the system, both at fixed chemical potentials and at fixed densities, is constructed, showing that the stability region of the FFLO state is significantly enlarged by the 1D potential. Subsequently, the influence of the potential on the FFLO pairing mechanism is investiga...