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arXiv 2201.03760cond-mat.dis-nncond-mat.quant-gas
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$p$波对Aubry-André-Harper模型的量子临界性和普适性

Quantum criticality and universality in the $p$-wave paired Aubry-André-Harper model

Ting Lv, Tian-Cheng Yi, Liangsheng Li, Gaoyong Sun, Wen-Long You

摘要:

利用广义保真度磁化率(GFS)研究了具有$p$波超导对$Δ$的Aubry-André-Harper(AAH)模型的量子临界性和普适性.结果表明,高阶GFS比低阶GFS更能有效地聚焦临界点,从而有利于从准周期系统的有限尺寸标度中提取相关的普适信息. GFS服从幂律缩放的本地化过渡,从而缩放属性的GFS提供令人信服的值的临界指数。具体来说,我们证明了固定的调制相位$ϕ=π$的缩放功能的奇偶效应跨越奥布里-安德烈过渡与$Δ=0$,而缩放功能的奇数和偶数的系统大小与有限的$Δ$不能重合,无论值的$ϕ$。对奇数个系统尺寸的数值分析表明,临界相到局域相的关联长度指数$ν\simeq 1.000$和动力学指数$z$ $\simeq$ 1.388,表明有限$p$波超导配对的AAH模型中局域化跃迁的普适性不同于Aubry-André跃迁.这些结果可以在近期最先进的实验环境中得到证实。

英文摘要:

We investigate the quantum criticality and universality in Aubry-André-Harper (AAH) model with $p$-wave superconducting pairing $Δ$ in terms of the generalized fidelity susceptibility (GFS). We show that the higher-order GFS is more efficient in spotlighting the critical points than lower-order ones, and thus the enhanced sensitivity is propitious for extracting the associated universal information from the finite-size scaling in quasiperiodic systems. The GFS obeys power-law scaling for localization transitions and thus scaling properties of the GFS provide compelling values of critical exponents. Specifically, we demonstrate that the fixed modulation phase $ϕ=π$ alleviates the odd-even effect of scaling functions across the Aubry-André transition with $Δ=0$, while the scaling functions for odd and even numbers of system sizes with a finite $Δ$ cannot coincide irrespective of the value of $ϕ$. A thorough numerical analysis with odd number of system sizes reveals the correlation-length exponent $ν\simeq 1.000$ and the dynamical exponent $z$ $\simeq$ 1.388 for transitions from the critical phase to the localized phase,suggesting the unusual universality class of localization transitions in the AAH model with a finite $p$-wave superconducting pairing lies in a different universality class from the Aubry-André transition. The results may be testified in near term state-of-the-art experimental settings.

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