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arXiv 0708.1304cond-mat.mes-hallcond-mat.str-el
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量子点中相互作用诱导的强局域化

Interaction-Induced Strong Localization in Quantum Dots

A. D. Guclu, A. Ghosal, C. J. Umrigar, H. U. Baranger

摘要:

我们认为,库仑阻塞现象是量子点中强关联交叉的一个有用的探针。通过在低密度下(r_s ~ 55)用变分和扩散量子Monte Carlo方法的计算,我们发现附加能从与壳层结构有关的特征到由Wigner晶体的可折叠性引起的特征有明显的发展。这种交叉(对于自旋极化的电子,发生在r_s ~ 20附近)是相互作用驱动的局域化的标志。由于附加能量在库仑阻塞电导实验中是直接可测量的,这提供了在低密度电子气中的定位的直接探针。

英文摘要:

We argue that Coulomb blockade phenomena are a useful probe of the cross-over to strong correlation in quantum dots. Through calculations at low density using variational and diffusion quantum Monte Carlo (up to r_s ~ 55), we find that the addition energy shows a clear progression from features associated with shell structure to those caused by commensurability of a Wigner crystal. This cross-over (which occurs near r_s ~ 20 for spin-polarized electrons) is, then, a signature of interaction-driven localization. As the addition energy is directly measurable in Coulomb blockade conductance experiments, this provides a direct probe of localization in the low density electron gas.

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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