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arXiv 2012.14102cond-mat.mes-hall
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非平衡近藤量子点系统中的电流噪声谱机制

Mechanism of current noise spectrum in a nonequilibirum Kondo dot system

Hong Mao, Jinshuang Jin, Shikuan Wang, YiJing Yan

AI总结:

本研究通过耗散子运动方程计算,系统分析非平衡近藤量子点电流噪声谱的特征与起源,揭示了拉比干涉和近藤-法诺干涉分别对应的谱学特征。

摘要:

我们基于精确的耗散子运动方程(dissipaton–equation–of–motion)计算,系统研究了量子噪声谱的非平衡近藤(Kondo)机制。通过对比平衡与非平衡情形、非近藤与近藤区域的噪声谱,我们识别出电流噪声谱中的非平衡近藤特征,其出现在$\omega\in [-eV, eV]$区间内。在$\omega=\pm eV=\pm (\mu_{\rm L}-\mu_{\rm R})$处的近藤特征,分别表现为$S(\omega)$的不对称上翘和$dS(\omega)/d\omega$的显著峰值。这些特征源于输运电流动力学的拉比(Rabi)干涉,对应的近藤振荡频率为$|eV|$。从$\omega=-eV$过渡到$\omega=+eV$处存在的微小但清晰可辨的拐点,可能与两个近藤共振通道之间的一类近藤-法诺(Kondo-Fano)干涉有关。

英文摘要:

We systematically study the nonequilibirum Kondo mechanisms of quantum noise spectrum based on the accurate dissipaton--equation--of--motion evaluations. By comparing the noise spectra between the equilibrium and nonequilibrium cases and between the non-Kondo and Kondo regimes, we identify the nonequilibrium Kondo features in the current noise spectrum, appearing in the region of $ω\in [-eV, eV]$. The Kondo characteristic at $ω=\pm eV=\pm (μ_{\rm L}-μ_{\rm R})$ display asymmetrical upturns and remarkable peaks in $S(ω)$ and $dS(ω)/dω$, respectively. These features are originated from the Rabi interference of the transport current dynamics, with the Kondo oscillation frequency of $|eV|$. The minor but very distinguishable inflections, crossing over $ω=-eV$ to $ω=+eV$, would be related to a sort of Kondo-Fano interference between two Kondo resonances channels.

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