Detecting Chirality in Two-Terminal Electronic Nanodevices.,Nano Letters

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Detecting Chirality in Two-Terminal Electronic Nanodevices.
Nano Letters ( IF 9.6 ) Pub Date : 2020-07-16 , DOI: 10.1021/acs.nanolett.0c02417
Xu Yang ₁ , Caspar H van der Wal ₁ , Bart J van Wees ₁

Affiliation

Central to spintronics is the interconversion between electronic charge and spin currents, and this can arise from the chirality-induced spin selectivity (CISS) effect. CISS is often studied as magnetoresistance (MR) in two-terminal (2T) electronic nanodevices containing a chiral (molecular) component and a ferromagnet. However, fundamental understanding of when and how this MR can occur is lacking. Here, we uncover an elementary mechanism that generates such an MR for nonlinear response. It requires energy-dependent transport and energy relaxation within the device. The sign of the MR depends on chirality, charge carrier type, and bias direction. Additionally, we reveal how CISS can be detected in the linear response regime in magnet-free 2T nanodevices, either by forming a chirality-based spin-valve using two or more chiral components or by Hanle spin precession in devices with a single chiral component. Our results provide operation principles and design guidelines for chirality-based spintronic nanodevices and technologies.

中文翻译：

在两个端子的电子纳米器件中检测手性。

自旋电子学的中心是电荷与自旋电流之间的相互转换，这可能是由手性诱导的自旋选择性（CISS）效应引起的。CISS通常在包含手性（分子）组分和铁磁体的两端（2T）电子纳米器件中作为磁阻（MR）研究。然而，缺乏对何时以及如何发生MR的基本理解。在这里，我们发现了生成这种用于非线性响应的MR的基本机制。它要求能量依赖的传输和设备内的能量松弛。MR的符号取决于手性，电荷载流子类型和偏置方向。此外，我们揭示了如何在无磁铁2T纳米器件的线性响应范围内检测到CISS，通过使用两个或多个手性组分形成基于手性的自旋阀，或通过在具有单个手性组分的装置中进行Hanle旋进进动。我们的结果为基于手性的自旋电子纳米器件和技术提供了操作原理和设计指南。

更新日期：2020-08-12

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