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首页> 外文期刊>Physical Review, A. Atomic, molecular, and optical physics >Pairing fluctuations and an anisotropic pseudogap phenomenon in an ultracold superfluid Fermi gas with plural p-wave superfluid phases
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Pairing fluctuations and an anisotropic pseudogap phenomenon in an ultracold superfluid Fermi gas with plural p-wave superfluid phases

机译：具有多个p波超流体相的超冷超流体费米气体中的配对波动和各向异性拟间隙现象

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摘要

We investigate the superfluid properties of a one-component Fermi gas with a uniaxially anisotropic p-wave pairing interaction, U-x > U-y = U-z [where U-i (i = x, y, z) is a p(i)-wave pairing interaction]. This type of interaction is considered to be realized in a K-40 Fermi gas. Including pairing fluctuations within a strong-coupling T-matrix theory, we determine the p(x)-wave superfluid phase transition temperature T-c(px), as well as the other phase transition temperature T-c(px+ ipy) (< T-c(px)), below which the superfluid order parameter has the p(x) + ip(y) -wave symmetry. In the normal state near T-c(px), p(x)-wave pairing fluctuations are shown to induce an anisotropic pseudogap phenomenon, where a dip structure in the angle-resolved density of states around omega = 0 is the most remarkable in the px direction. In the p(x)-wave superfluid phase (T-c(px+ipy) < T <= T-c(px)), while the pseudogap in the px direction continuously changes to the superfluid gap, the pseudogap in the perpendicular direction to the px axis is found to continue developing because of enhanced p(y)-wave and p(z)-wave pairing fluctuations around the node of the p(x)-wave superfluid order parameter. Since pairing fluctuations are always suppressed in the isotropic s-wave superfluid state, this phenomenon is peculiar to an unconventional Fermi superfluid with a nodal superfluid order parameter. Since the p-wave Fermi superfluid is the most promising non-s-wave pairing state in an ultracold Fermi gas, our results would contribute to understanding how the anisotropic pairing fluctuations, as well as the existence of plural superfluid phases, affect many-body properties of this unconventional Fermi superfluid.
机译：我们研究具有单轴各向异性p波配对相互作用的单组分费米气体的超流体性质，U-x> U-y = U-z [其中U-i（i = x，y，z）是p（i）波配对相互作用]。这种相互作用被认为是在K-40费米气体中实现的。包括强耦合T矩阵理论中的配对波动，我们确定p（x）波超流体相变温度Tc（px）以及其他相变温度Tc（px + ipy）（

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