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arXiv 1012.4838cond-mat.mes-hallcond-mat.str-el
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横向耦合双量子点中的近藤效应和散粒噪声增强

Kondo effects and shot noise enhancement in a laterally coupled double quantum dot

Toshihiro Kubo, Yasuhiro Tokura, Seigo Tarucha

摘要:

研究了横向耦合双量子点中的自旋和轨道近藤效应以及相关的散粒噪声。我们计算了各种电荷态的线性电导和散粒噪声,以区分自旋和轨道近藤效应。我们发现,当每个量子点只包含一个电子时,相干间接耦合可以产生一种新的反铁磁交换耦合,这种耦合可以抑制自旋近藤效应,并且我们还发现,我们可以从散粒噪声测量中捕捉到赝自旋近藤效应的特征.

英文摘要:

The spin and orbital Kondo effects and the related shot noise for a laterally coupled double quantum dot are studied taking account of coherent indirect coupling via a reservoir. We calculate the linear conductance and shot noise for various charge states to distinguish between the spin and orbital Kondo effects. We find that a novel antiferromagnetic exchange coupling can be generated by the coherent indirect coupling, and it works to suppress the spin Kondo effect when each quantum dot holds just one electron. We also show that we can capture the feature of the pseudospin Kondo effect from the shot noise measurement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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