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arXiv 1507.06978cond-mat.mes-hall
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室温下红外线对纳米线自旋弛豫的调制

Modulating spin relaxation in nanowires with infrared light at room temperature

Md. Iftekhar Hossain, Saumil Bandyopadhyay, Jayasimha Atulasimha, Supriyo Bandyopadhyay

摘要:

自旋电子器件通常依赖于长的自旋弛豫时间和/或长度以获得最佳性能。因此,用外部试剂调节这些量的能力提供了独特的可能性。在大多数技术上重要的半导体中占主导地位的自旋弛豫机制是D 'yakonov-Perel'(DP)机制,如果自旋载流子(电子)被限制在以某些结晶方向生长的量子线或多晶量子线中的单个传导子带,则DP机制消失。在这里,我们报告调制DP自旋弛豫速率(因此自旋弛豫长度)在自组装的50 nm直径的InSb纳米线与红外线在室温下。在黑暗中,几乎所有的电子在纳米线是在最低的传导子带在室温下,导致在DP弛豫几乎完全没有。这允许在磁阻中观察自旋敏感效应。在红外光照下,电子被光激发到更高的子带,DP自旋弛豫机制被恢复,导致自旋弛豫长度减少三倍。因此,在照明下不再观察到自旋敏感效应。这一现象在自旋电子学室温红外光电探测中可能有应用。

英文摘要:

Spintronic devices usually rely on long spin relaxation times and/or lengths for optimum performance. Therefore, the ability to modulate these quantities with an external agent offers unique possibilities. The dominant spin relaxation mechanism in most technologically important semiconductors is the D'yakonov-Perel' (DP) mechanism which vanishes if the spin carriers (electrons) are confined to a single conduction subband in a quantum wire grown in certain crystallographic directions, or polycrystalline quantum wires. Here, we report modulating the DP spin relaxation rate (and hence the spin relaxation length) in self assembled 50-nm diameter InSb nanowires with infrared light at room temperature. In the dark, almost all the electrons in the nanowires are in the lowest conduction subband at room temperature, resulting in near-complete absence of DP relaxation. This allows observation of spin-sensitive effects in the magnetoresistance. Under infrared illumination, electrons are photoexcited to higher subbands and the DP spin relaxation mechanism is revived, leading to a three-fold decrease in the spin relaxation length. Consequently, the spin sensitive effects are no longer observable under illumination. This phenomenon may have applications in spintronic room-temperature infrared photodetection.

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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