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Delayed Currents And Interaction Effects In Mesoscopic Capacitors

机译:介观电容器中的延迟电流和相互作用效应

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摘要

We propose an alternative derivation for the dynamic admittance of a gated quantum dot connected by a single-channel lead to an electron reservoir. Our derivation, which reproduces the result of Pretre, Thomas, and Buettiker for the universal charge-relaxation resistance, shows that at low frequencies, the current leaving the dot lags after the entering one by the Wigner-Smith delay time. We compute the capacitance when interactions are taken into account only on the dot within the Hartree-Fock approximation and study the Coulomb-blockade oscillations as a function of the Fermi energy in the reservoir. In particular we find that those oscillations disappear when the dot is fully "open," thus we reconcile apparently conflicting previous results.
机译:我们提出了一种替代推导方法,用于通过单通道引线连接到电子库的门控量子点的动态导纳。我们的推导重现了Pretre,Thomas和Buettiker的通用电荷松弛电阻的结果,该推导表明,在低频下,离开点的电流在经过Wigner-Smith延迟时间进入点之后才滞后。当仅在Hartree-Fock近似内的点上考虑相互作用时,我们计算电容,并研究库仑阻塞振动作为储层中费米能量的函数。特别是,我们发现当点完全“打开”时,这些振荡消失了,因此,我们调和了与先前结果明显矛盾的方法。

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