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arXiv 1012.5924cond-mat.mes-hallcond-mat.mtrl-sci
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三角形分子中的线性和非线性Stark效应

Linear and nonlinear Stark effect in triangular molecule

Bogdan R. Bulka, Tomasz Kostyrko, Jakub Luczak

摘要:

我们分析了三角形分子在电场的影响下电子结构的变化(即,Stark效应)。的字段的效果被证明是各向异性的,包括一个线性和非线性部分。对于强电子关联,我们明确地推导出交换耦合的有效自旋哈密顿量。在某些情况下,我们可以找到一个暗自旋态,其中一个自旋与其他自旋解耦。该模型也适用于研究电子输运通过系统的三个相干耦合量子点。由于电子转移速率是各向异性的,电流特性也是各向异性的,对于小的和大的电场是不同的。

英文摘要:

We analyze changes of the electronic structure of a triangular molecule under the influence of an electric field (i.e., the Stark effect). The effects of the field are shown to be anisotropic and include both a linear and a nonlinear part. For strong electron correlations, we explicitly derive exchange couplings in an effective spin Hamiltonian. For some conditions one can find a dark spin state, for which one of the spins is decoupled from the others. The model is also applied for studying electronic transport through a system of three coherently coupled quantum dots. Since electron transfer rates are anisotropic, the current characteristics are anisotropic as well, differing for small and large electric field.

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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