Homogeneous Fermion Superfluid with Unequal Spin Populations
Homogeneous Fermion Superfluid with Unequal Spin Populations
复制标题
具有不等自旋种群的均质费米子超流体
DOI：
10.1007/s10909-007-9350-9
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发表时间：
2006
影响因子：
2
通讯作者：
H. Zhai
中科院分区：
文献类型：
--
作者：
T. Ho;H. Zhai
几十年来，传统的观点认为，s波BCS超流体不能支持均匀的自旋极化，这是由于准粒子激发谱中的间隙Δ。我们表明，这是一个伪像的解雇quasiparticle interactionsVqpin的传统方法在一开始。这样的相互作用可以引起基态中的三重态波动，并且因此在“磁场“h<Δ下引起非零自旋极化。由此产生的基态是在“BCS真空”上的准粒子的配对态。对于足够大的Vqp，么正性的自旋极化具有简单的形式m μ1/2。我们的研究是由最近的实验费米气体的自旋不平衡在强相互作用制度的动机。
For decades, the conventional view is that an s-wave BCS superfluid can not support uniform spin polarization due to a gapΔin the quasiparticle excitation spectrum. We show that this is an artifact of the dismissal of quasiparticle interactionsVqpin the conventional approach at the outset. Such interactions can cause triplet fluctuations in the ground state and hence non-zero spin polarization at “magnetic field”h<Δ. The resulting ground state is a pairing state of quasiparticles on the “BCS vacuum”. For sufficiently largeVqp, the spin polarization of at unitarity has the simple formm∝μ1/2. Our study is motivated by the recent experiments on Fermi gases with spin imbalance in the strongly interacting regime.