Superconductivity out of a non-Fermi liquid: Free energy analysis

Superconductivity out of a non-Fermi liquid: Free energy analysis
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非费米液体的超导性:自由能分析

DOI:
10.1103/physrevb.106.144513
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Chubukov, Andrey V.
Chubukov, Andrey V.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, Shang-Shun;Wu, Yi-Ming;Abanov, Artem;Chubukov, Andrey V.

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在本文中,我们提出了一个深入的分析的情况下,超导体的凝聚能出现的非费米液体由于配对介导的无质量玻色子。这是电子介导的配对附近的量子临界点的金属,配对SYK型模型,并在适当定义的限制声子介导的配对的情况下,当德拜频率消失。我们考虑这些量子临界模型的一个子集,其中在一个适当的空间对称性的通道中的配对是由一个有效的动力学相互作用的有效维模型,其中是模型特定的(模型)。在以前的文章中,我们讨论了模型中的配对与费米液体中的配对有本质的不同,并且差距方程有无穷多个拓扑不同的解,其中一个整数,在0和无穷之间,是正松原轴上的零点的数目。这就产生了一组的极值,其中的全球最低。谱在一般情况下是离散的,但在时是连续的。在这里,我们更详细地讨论了附近的凝聚能的轮廓和从一个离散到一个连续的光谱在转换。我们还讨论了该模型在正常状态下的自由能和比热。
In this paper, we present an in-depth analysis of the condensation energyfor a superconductor in a situation when superconductivity emerges out of a non-Fermi liquid due to pairing mediated by a massless boson. This is the case for electronic-mediated pairing near a quantum-critical point in metal, for pairing in SYK-type models, and for phonon-mediated pairing in the properly defined limit, when the dressed Debye frequency vanishes. We consider a subset of these quantum-critical models, in which the pairing in a channel with a proper spatial symmetry is described by an effectivedimensional model with the effective dynamical interaction, whereis model-specific (themodel). In previous papers, we argued that the pairing in themodel is qualitatively different from that in a Fermi liquid, and the gap equation athas an infinite number of topologically distinct solutions,, where an integer, running between 0 and infinity, is the number of zeros ofon the positive Matsubara axis. This gives rise to the set of extrema ofat, of whichis the global minimum. The spectrumis discrete for a genericbut becomes continuous at. Here, we discuss in more detail the profile of the condensation energy near eachand the transformation from a discrete to a continuous spectrum at. We also discuss the free energy and the specific heat of themodel in the normal state.
耦合到规范场的费米子的规范不变响应函数。
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发表时间: 1994
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影响因子: --
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发表时间: 2022
期刊: Physical review B
影响因子: 3.7
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DOI: 10.1103/physrevb.43.5355
发表时间: 1991
期刊: Physical review. B, Condensed matter
影响因子: --
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