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arXiv 1710.09445cond-mat.mes-hall
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Poly-T包裹单壁碳纳米管的自旋过滤

Spin Filtering with Poly-T Wrapped Single Wall Carbon Nanotubes

K. M. Alam, Sandipan Pramanik

摘要:

自旋滤波是自旋电子学中的一个基本操作,它允许产生和检测自旋极化载流子。在大多数情况下,过渡金属铁磁体被用作自旋过滤器,尽管它们的自旋过滤效率仅为约50%,从而限制了自旋电子器件的效率。最近,手性系统如DNA已被证明表现出有效的自旋过滤,这种现象通常被称为“手性诱导的自旋选择性”(CISS)。在这项工作中,我们考虑单壁碳纳米管螺旋缠绕单链聚T DNA。通过磁电阻测量,我们表明,该系统具有显着的自旋极化~ 80%,这可能是由于Rashba自旋轨道相互作用引起的反转不对称螺旋势的DNA。观察到的自旋极化大于之前报道的d(GT)15股。这样的系统允许通过化学手段定制自旋极化,并且还允许在没有任何磁性元件的情况下极其局部地产生和检测自旋极化,并且可以导致自旋电子器件和电路的极端小型化和紧凑集成。

英文摘要:

Spin filtering is an essential operation in spintronics that allows creation and detection of spin polarized carriers. Transition metal ferromagnets are used as spin filters in most cases, though their spin filtering efficiency is only around ~50%, thereby limiting the efficiency of spintronic devices. Recently, chiral systems such as DNA have been shown to exhibit efficient spin filtering, a phenomenon often dubbed as "chirality induced spin selectivity" (CISS). In this work, we consider single wall carbon nanotubes helically wrapped with single stranded poly-T DNA. By magnetoresistance measurements we show that this system exhibits significant spin polarization of ~80%, which could be attributed to the Rashba spin-orbit interaction induced by the inversion asymmetric helical potential of the DNA. Observed spin polarization is larger than that reported before for d(GT)15 strands. Such systems allow tailoring spin polarization by chemical means and also allow extremely localized creation and detection of spin polarization without any magnetic element and could lead to extreme miniaturization and compact integration of spintronic devices and circuits.

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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