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arXiv 1104.2660cond-mat.mes-hallcond-mat.str-el
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散粒噪声探测量子点中近藤效应的演化

Evolution of the Kondo Effect in a Quantum Dot Probed by the Shot Noise

Yoshiaki Yamauchi, Koji Sekiguchi, Kensaku Chida, Tomonori Arakawa, Shuji Nakamura, Kensuke Kobayashi, Teruo Ono, Tatsuya Fujii, Rui Sakano

摘要:

为了研究近藤效应的非平衡性质,我们测量了近藤机制下量子点中的电流和散粒噪声。通过系统地调节温度和栅极电压来定义量子点中的能级位置,我们观察到随着温度降低到近藤温度以下,散粒噪声增强,这表明两粒子散射过程随着近藤状态的演变而增长。在近藤温度以下,有限温度下的Fano因子超过了非相互作用模型的期望值,达到了$1.8 \pm 0.2$。

英文摘要:

We measure the current and shot noise in a quantum dot (QD) in the Kondo regime to address the non-equilibrium properties of the Kondo effect. By systematically tuning the temperature and gate voltages to define the level positions in the QD, we observe an enhancement of the shot noise as temperature decreases below the Kondo temperature, which indicates that the two-particle scattering process grows as the Kondo state evolves. Below the Kondo temperature, the Fano factor defined at finite temperature is found to exceed the expected value of unity from the non-interacting model, reaching $1.8 \pm 0.2$.

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