Iskin M, Sá de Melo C A R
School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Phys Rev Lett. 2006 Feb 3;96(4):040402. doi: 10.1103/PhysRevLett.96.040402. Epub 2006 Jan 31.
We consider the evolution of superfluid properties of a three-dimensional p-wave Fermi gas from a weak coupling Bardeen-Cooper-Schrieffer (BCS) to strong coupling Bose-Einstein condensation (BEC) limit as a function of scattering volume. At zero temperature, we show that a quantum phase transition occurs for p-wave systems, unlike the s-wave case where the BCS to BEC evolution is just a crossover. Near the critical temperature, we derive a time-dependent Ginzburg-Landau (GL) theory and show that the GL coherence length is generally anisotropic due to the p-wave nature of the order parameter, and becomes isotropic only in the BEC limit.
我们研究了三维p波费米气体超流性质随散射体积的变化，其从弱耦合的巴丁-库珀-施里弗（BCS）极限演化到强耦合的玻色-爱因斯坦凝聚（BEC）极限。在零温度下，我们表明p波系统会发生量子相变，这与s波情况不同，在s波情形中BCS到BEC的演化仅仅是一个渡越过程。在临界温度附近，我们推导了一个含时的金兹堡-朗道（GL）理论，并表明由于序参量的p波性质，GL相干长度通常是各向异性的，并且仅在BEC极限下变为各向同性。
