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Low-rank Sachdev-Ye-Kitaev models

机译:低级Sachdev-Ye-Kitaev型号

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摘要

Motivated by recent proposals of experimental realization of fast scramblers, we study a family of solvable variants of the (q = 4) Sachdev-Ye-Kitaev model in which the rank and eigenvalue distribution of the coupling matrix J_(ij,kl) are tuneable. When the rank is proportional to the number of fermions, the low temperature behavior is sensitive to the eigenvalue distribution. We obtain a complete classification of the possible non-Fermi liquid quantum phases. These include two previously studied phases whose fermion scaling dimension depends continuously on the rank; we show that they are maximally chaotic, but necessitate an extensively degenerate or negative semidefinite coupling matrix. More generic distributions give rise to "almost Fermi liquids" with a scaling dimension Δ = 1/2, but which differ from a genuine Fermi liquid in quasiparticle decay rate, quantum Lyapunov exponent, and/or specific heat.
机译:通过最近的快速爬行器的实验性实现建议,我们研究了一种(Q = 4)SACHDEV-YE-Kitaev模型的可溶性变体系列,其中耦合矩阵J_(IJ,KL)的等级和特征值分布是可调调谐的。当等级与费粒的数量成比例时,低温行为对特征值分布敏感。我们获得了可能的非费米液量子阶段的完整分类。这些包括两个先前研究的阶段,其铁缆缩放尺寸在级别上连续取决于级别;我们表明它们最大化混乱,但需要广泛的退化或负半纤维偶联基质。更通用的分布产生“几乎费米液体”,缩放尺寸δ= 1/2,但是与Quasiplicle衰减率,量子Lyapunov指数和/或特定热量的真正费米液不同。

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  • 来源
    《Physical review》 |2020年第12期|125112.1-125112.12|共12页
  • 作者单位

    Department of Physics University of California Berkeley California 94720 USA;

    Department of Physics University of California Berkeley California 94720 USA;

    Department of Physics University of California Berkeley California 94720 USA;

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