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Pairing instability on a Luttinger surface: A non-Fermi liquid to superconductor transition and its Sachdev-Ye-Kitaev dual

机译:在lepttinger表面上的不稳定性:超导体过渡的非费米液及其Sachdev-ye-kitaev双重

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摘要

Superconductivity results from an instability of the Fermi surface-contour of poles of the single-particle propagator-to an inlinitesimally small attraction between electrons. Here, we instead discuss the analogous problem on a model Luttinger surface, or contour of zeros of the Green function. At zero temperature (β →∞) and a critical interaction strength (u_(c∞)) characterized by the residue of self-energy pole, we find that the pair susceptibility diverges leading to a superconducting instability. We evaluate the pair fluctuation partition function and find that the spectral density in the normal state has an interaction-driven, power-law 1/ω~(1/2) type, van-Hove singularity (vHS). indicating non-Fermi liquid (NFL) physics. Crucially, in the strong coupling limit (βu ≫1). the leading-order fluctuation free-energy terms in the normal state of this NFL-SC transition resembles the equivalent [O( 1)) terms of the Sachdev-Ye-Kitaev (SYK) model. This free-energy contribution takes a simple form -βF = βu_(c∞) -γ ln(βu_(c∞)), where y is a constant equal to 1/2. Weak impurity scattering (τ ≫ β~(-1)) leaves the low-energy spectral density unaffected but leads to an interaction-driven enhancement of superconductivity. Our results shed light on the role played by order-parameter fluctuations in providing the key missing link between Mott physics and strongly coupled toy models exhibiting gravity duals.
机译:超导是由单粒子传播者的恒极的不稳定性的不稳定性 - 到电子之间的内透明的吸引力。在这里,我们讨论了在模型Luttinger表面上的类似问题,或绿色功能的零轮廓。在零温度(β→∞)和临界相互作用强度(U_(C 1)),其特征在于自能杆的残留物,我们发现该对易感性发散导致超导不稳定性。我们评估了对波动分区功能,并发现正常状态下的频谱密度具有相互作用驱动的,电力法1 /ω〜(1/2)类型,van-hove奇点(VHS)。表示非费米液体(NFL)物理学。至关重要的是,在强耦合极限(βu»)。该NFL-SC转换的正常状态下的前导波动自由能术语类似于Sachdev-ye-Kitaev(SYK)模型的等效[O(1))条款。这种自由能贡献采用简单的形式-βF=βU_(C 1)-γLN(βU_(C∞)),其中Y是恒定等于1/2的常数。弱杂质散射(τ»β〜(-1))留下了不受影响的低能谱密度,而是导致超导性的相互作用增强。我们的结果阐明了订单参数波动所扮演的作用,在提供媒体物理学和展示重力双重的强耦合玩具模型之间的关键缺失联系。

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  • 来源
    《Physical review》 |2020年第18期|184506.1-184506.14|共14页
  • 作者

    Chandan Setty;

  • 作者单位

    Department of Physics University of Florida Gainesville Florida 32611 USA;

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  • 正文语种 eng
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