Shi T, Zou S-H, Hu H, Sun C-P, Yi S
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China and Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany.
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China.
Phys Rev Lett. 2013 Jan 25;110(4):045301. doi: 10.1103/PhysRevLett.110.045301. Epub 2013 Jan 24.
The superfluid phases in resonant dipolar Fermi gases are investigated by the standard mean-field theory. In contrast to the crossover from Bose-Einstein condensation (BEC) to Bardeen-Cooper-Schrieffer superfluid in Fermi gases with isotropic interactions, resonant dipolar interaction leads to two completely different BEC phases of the tight-binding Fermi molecules on both sides of the resonance, which are characterized by two order parameters with distinct internal symmetries. We point out that, near the resonances, the two competitive phases can coexist, and an emergent relative phase between the two order parameters spontaneously breaks time-reversal symmetry, which could be observed in momentum resolved rf spectroscopy.
通过标准平均场理论研究了共振偶极费米气体中的超流相。与具有各向同性相互作用的费米气体中从玻色-爱因斯坦凝聚（BEC）到巴丁-库珀-施里弗超流的转变不同，共振偶极相互作用导致在共振两侧紧密束缚费米分子的两个完全不同的BEC相，其特征是具有不同内部对称性的两个序参量。我们指出，在共振附近，这两个竞争相可以共存，并且两个序参量之间出现的相对相位会自发地破坏时间反演对称性，这可以在动量分辨射频光谱中观察到。
