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arXiv 2207.02707cond-mat.mes-hallcond-mat.str-el
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半导体量子点系综中有效自旋-自旋相互作用的微观起源

Microscopic origin of the effective spin-spin interaction in a semiconductor quantum dot ensemble

Frederik Vonhoff, Andreas Fischer, Kira Deltenre, Frithjof B. Anders

摘要:

我们提出了一个单电荷量子点系综的微观模型,以揭示量子点中电子自旋之间的长程有效相互作用的起源。Wilson数值重整化群(NRG)被用来计算由生长诱导润湿层介导的有效自旋-自旋相互作用的大小和空间依赖性。令人惊讶的是,我们发现了一个反铁磁海森堡耦合非常短的量子点间的距离,这是由显着的粒子-空穴不对称性的润湿层带在非常低的填充。使用NRG的结果从现实的参数作为输入的半经典模拟的一个大的QD系综,我们表明,实验报告的相移之间的相干自旋动力学单色和双色激光泵浦可以重现我们的模型,解决了一个长期以来的神秘的微观起源的量子点间的电子自旋-自旋相互作用。

英文摘要:

We present a microscopic model for a singly charged quantum dot (QD) ensemble to reveal the origin of the long-range effective interaction between the electron spins in the QDs. Wilson's numerical renormalization group (NRG) is used to calculate the magnitude and the spatial dependency of the effective spin-spin interaction mediated by the growth induced wetting layer. Surprisingly, we found an antiferromagnetic Heisenberg coupling for very short inter-QD distances that is caused by the significant particle-hole asymmetry of the wetting layer band at very low filling. Using the NRG results obtained from realistic parameters as input for a semiclassical simulation for a large QD ensemble, we demonstrate that the experimentally reported phase shifts in the coherent spin dynamics between single and two color laser pumping can be reproduced by our model, solving a longstanding mystery of the microscopic origin of the inter QD electron spin-spin interaction.

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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