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arXiv 1806.03092cond-mat.mes-hall
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光学探测多层体系中的长寿命自旋相干性:双量子阱和三量子阱

Optically-detected long-lived spin coherence in multilayer systems: Double and triple quantum wells

S. Ullah, G. M. Gusev, A. K. Bakarov, F. G. G. Hernandez

摘要:

在本文中,我们研究了限制在多层系统中的高迁移率致密二维电子气的自旋相干性。利用时间分辨克尔旋转和共振自旋放大技术,对光致自旋极化的动力学过程进行了实验研究。对于双量子阱和三量子阱掺杂超过金属-绝缘体过渡,自旋相干性被大大抑制,我们发现显着长的自旋寿命限制的Dyakonov-Perel机制和自旋跳跃过程之间的施主网站,以及传播的合奏g-因子。双量子阱结构在T = 5 K时的自旋寿命为6.25 ns,而三量子阱结构在T = 8 K时的自旋寿命超过25 ns。

英文摘要:

In this contribution, we investigated the spin coherence of high-mobility dense two-dimensional electron gases confined in multilayer systems. The dynamics of optically-induced spin polarization was experimentally studied employing the time-resolved Kerr rotation and resonant spin amplification techniques. For both the double and triple quantum wells doped beyond the metal-insulator transition, where the spin coherence is greatly suppressed, we found remarkably long spin lifetimes limited by the Dyakonov-Perel mechanism and spin hopping process between the donor sites as well as the spread of ensemble g-factor. The double quantum well structure yields a spin lifetime of 6.25 ns at T = 5 K while the triple quantum well shows a spin lifetime exceeding 25 ns at T = 8 K.

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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