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arXiv 2402.02157cond-mat.mes-hall
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量子点接触输运中反 Pfaffian 拓扑序的指纹

Fingerprints of anti-Pfaffian topological order in quantum point contact transport

Jinhong Park, Christian Spånslätt, Alexander D. Mirlin

AI总结:

该研究分析电荷平衡量子点接触中的电导与散粒噪声,提出利用 $G=(7/3)e^2/h$ 平台的两种形成机制及相干区电导特征识别 $ν=5/2$ 的 anti-Pfaffian 拓扑序。

摘要:

尽管近期实验取得进展,填充因子 $ν=5/2$ 处分数量子霍尔态的拓扑序仍是一个悬而未决的问题。我们研究电荷平衡区域中量子点接触器件的电导和散粒噪声,并表明,在 Pfaffian、粒子-空穴 Pfaffian 和反 Pfaffian(aPf)候选态中,空穴共轭的 aPf 态具有独特性:它能够通过两种根本不同的机制产生位于 $G=(7/3)e^2/h$ 的电导平台。我们证明,这些机制可以通过测量平台上的散粒噪声加以区分。我们还确定了 aPf 态在相干区域中的不同电导特征。我们的结果可用于在实验上单独识别 aPf 序。

英文摘要:

Despite recent experimental developments, the topological order of the fractional quantum Hall state at filling $ν=5/2$ remains an outstanding question. We study conductance and shot noise in a quantum point contact device in the charge-equilibrated regime and show that, among Pfaffian, particle-hole Praffian, and anti-Pfaffian (aPf) candidate states, the hole-conjugate aPf state is unique in that it can produce a conductance plateau at $G=(7/3)e^2/h$ by two fundamentally distinct mechanisms. We demonstrate that these mechanisms can be distinguished by shot noise measurements on the plateaus. We also determine distinct features of the conductance of the aPf state in the coherent regime. Our results can be used to experimentally single out the aPf order.

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