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arXiv 0711.4552cond-mat.mes-hall
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近藤关联引起的QD输运中的双电子聚束

Two-electron bunching in transport through a QD induced by Kondo correlations

O. Zarchin, M. Zaffalon, M. Heiblum, D. Mahalu, V. Umansky

摘要:

我们报道了近藤关联下量子点的噪声测量。接近幺正极限,电导达到1.8e 2/h,我们观察到平均背散射电荷e*~5e/3,同时弱偏置量子点。这一结果保持偏置电压高达近藤温度的一半。在远离幺正极限的情况下,电荷被测量为e,如预期的那样。这些结果证实并推广了E. Sela等人[1]提出,在么正极限附近,双电子背散射过程优于单电子背散射过程,平均背散射电荷e*~5e/3。

英文摘要:

We report on noise measurements in a quantum dot in the presence of Kondo correlations. Close to the unitary limit, with the conductance reaching 1.8e2/h, we observed an average backscattered charge of e*~5e/3, while weakly biasing the quantum dot. This result held to bias voltages up to half the Kondo temperature. Away from the unitary limit, the charge was measured to be e as expected. These results confirm and extend the prediction by E. Sela et al. [1], that suggested that two-electron backscattering processes dominate over single-electron backscattering processes near the unitary limit, with an average backscattered charge e*~5e/3.

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