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arXiv 1006.4286cond-mat.str-el
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单重态-三重态跃迁的非平衡输运理论:微扰方法

Non-equilibrium transport theory of the singlet-triplet transition: perturbative approach

Bertalan Horváth, Bence Lazarovits, Gergely Zaránd

摘要:

采用非平衡态两能级Anderson模型,利用简单的迭代微扰理论研究了横向和纵向量子点中的单重态-三重态(ST)跃迁。令人惊讶的是,稳定微扰理论的范围扩展到相对强相互作用,这种简单的方法能够再现所有实验观察到的ST转变的特征,包括形成一个下降的微分电导的横向点指示两阶段的近藤效应,或在过渡点周围的线性电导的最大值。然而,选择正确的微扰理论起点对于获得可靠且有意义的结果至关重要。

英文摘要:

We use a simple iterative perturbation theory to study the singlet-triplet (ST) transition in lateral and vertical quantum dots, modeled by the non-equilibrium two-level Anderson model. To a great surprise, the region of stable perturbation theory extends to relatively strong interactions, and this simple approach is able to reproduce all experimentally-observed features of the ST transition, including the formation of a dip in the differential conductance of a lateral dot indicative of the two-stage Kondo effect, or the maximum in the linear conductance around the transition point. Choosing the right starting point to the perturbation theory is, however, crucial to obtain reliable and meaningful results.

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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