arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1108.4907cond-mat.mtrl-scicond-mat.other
收藏

硅中的场致负微分自旋寿命

Field-induced negative differential spin lifetime in silicon

Jing Li, Lan Qing, Hanan Dery, Ian Appelbaum

摘要:

我们发现,电场诱导的热不对称性之间的电子和晶格系统在纯硅的身份的主要自旋弛豫机制的影响。长距离自旋输运装置的经验结果与详细的蒙特卡罗模拟的比较证实了一个强的自旋去极化,超出了标准的埃利奥特-亚费特理论已经在低温下的预期。增强的自旋翻转机制归因于声子发射过程,在该过程中,电子在位于不同晶轴上的导带谷之间散射。这导致异常行为,其中(超过临界场)自旋注入器和自旋检测器之间的渡越时间的减少伴随着自旋极化的反直觉减少和明显的负自旋寿命。

英文摘要:

We show that the electric field-induced thermal asymmetry between the electron and lattice systems in pure silicon substantially impacts the identity of the dominant spin relaxation mechanism. Comparison of empirical results from long-distance spin transport devices with detailed Monte-Carlo simulations confirms a strong spin depolarization beyond what is expected from the standard Elliott-Yafet theory already at low temperatures. The enhanced spin-flip mechanism is attributed to phonon emission processes during which electrons are scattered between conduction band valleys that reside on different crystal axes. This leads to anomalous behavior, where (beyond a critical field) reduction of the transit time between spin-injector and spin-detector is accompanied by a counterintuitive reduction in spin polarization and an apparent negative spin lifetime.

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。

↑