论文标题
Fulde-Ferrell-Larkin-Ovchinnikov超级流体Fermi原子气的可行性
Feasibility of a Fulde-Ferrell-Larkin-Ovchinnikov superfluid Fermi atomic gas
论文作者
论文摘要
从理论上讲，我们探索了一种有希望的途径，以实现在自旋影响的超低费米气体中以fulde-ferrell-larkin-ovchinnikov（FFLO）状态。在当前冷原子物理学的阶段，寻找这种异国情调的费米超级流体面临两个严重的困难：一个是通过FFLO配对波动迫切破坏FFLO远程秩序，即使在三个维度中，这也阻止了通过二阶转移进入阶段的情况。另一个是与相位分离为BCS（Bardeen-Cooper-Schrieffer）状态的激烈竞争和自旋极化的正常状态。在Nozières和Schmitt-Rink开发的强耦合理论的框架内，包括强大的FFLO配对波动，我们表明，光学晶格引入的费米表面的各向异性使FFLO态稳定在削皮波动上。还发现这种稳定的FFLO状态能够在一定条件下以相位分离来克服竞争。由于实现非常规费米超流体是冷原子物理学中最令人兴奋的挑战之一，因此我们的结果将有助于该领域的进一步发展。
We theoretically explore a promising route to achieve the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in a spin-imbalanced ultracold Fermi gas. In the current stage of cold atom physics, search for this exotic Fermi superfluid is facing two serious difficulties: One is the desperate destruction of the FFLO long-range order by FFLO pairing fluctuations, which precludes entering the phase through a second-order transition, even in three dimension. The other is the fierce competition with the phase separation into the BCS (Bardeen-Cooper-Schrieffer) state and the spin-polarized normal state. Including strong FFLO pairing fluctuations within the framework of the strong-coupling theory developed by Nozières and Schmitt-Rink, we show that the anisotropy of Fermi surface introduced by an optical lattice makes the FFLO state stable against the paring fluctuations. This stabilized FFLO state is also found to be able to overcome the competition with the phase separation under a certain condition. Since the realization of unconventional Fermi superfluids is one of the most exciting challenges in cold atom physics, our results would contribute to the further development of this field.
