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arXiv · 1101.0468

Many-body Correlation Effect on Mesoscopic Charge Relaxation

Minchul Lee·Rosa Lopez·Mahn-Soo Choi·Thibaut Jonckheere·Thierry Martin
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Abstract

We investigate in a nonperturbative way the dynamics of a correlated quantum capacitor. We find that the many-body correlations do not disturb the universal low-frequency relaxation resistance per channel, $R_q(ω=0) = h/4e^2$ ensured by the Korringa-Shiba rule whereas the interpretation of the quantum capacitance $C_q$ in terms of the density of states fails when strong correlations are present. The AC resistance $R_q(ω)$ shows huge peaks (with values larger than $h/4e^2$) at $\hbarω\approx \pm Γ^*$, where $Γ^*$ is the renormalized level broadening. These peaks are merged to a single one at $ω=0$ when a finite Zeeman field is applied comparable to $Γ^*$. The observed features of $R_q$, being most evident in the Kondo regime, are attributed to the generation of particle-hole excitations in the contacts accomplished by spin-flip processes in the dot.

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Minchul Lee, Rosa Lopez, Mahn-Soo Choi, Thibaut Jonckheere, Thierry Martin. 2011-01-03. Many-body Correlation Effect on Mesoscopic Charge Relaxation. https://doi.org/10.1103/physrevb.83.201304

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