Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Phys Rev Lett. 2012 Jun 15;108(24):245301. doi: 10.1103/PhysRevLett.108.245301.
We study the vortex structures of a (pseudo)spin-1/2 Fermi gas experiencing a uniform effective magnetic field in an anisotropic trap that interpolates between quasi-one dimensional (1D) and quasi-two dimensional (2D). At a fixed chemical potential, reducing the anisotropy (or equivalently increasing the attractive interactions or increasing the magnetic field) leads to instabilities towards pair density waves and vortex lattices. Reducing the chemical potential stabilizes the system. We calculate the phase diagram and explore the density and pair density. The structures are similar to those predicted for superfluid Bose gases. We further calculate the paired fraction, showing how it depends on the chemical potential and anisotropy.
我们研究了在从准一维（1D）到准二维（2D）过渡的各向异性陷阱中，处于均匀有效磁场中的（赝）自旋-1/2 费米气体的涡旋结构。在固定化学势下，降低各向异性（或等效地增加吸引相互作用或增加磁场）会导致对配对密度波和涡旋晶格的不稳定性。降低化学势可以稳定系统。我们计算了相图并研究了密度和配对密度。这些结构与对超流玻色气体的预测相似。我们进一步计算了配对分数，展示了它如何取决于化学势和各向异性。
