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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Chiral-induced spin selectivity: A polaron transport model
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Chiral-induced spin selectivity: A polaron transport model

机译：手性诱导的旋转选择性：极化子传输模型

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摘要

Weak hyperfine interactions and spin-orbit coupling (SOC) in organic materials result in long spin lifetimes, which is very promising for spintronics. On the other hand, they also make it challenging to achieve spin polarization, which is of crucial importance for spintronics devices. To overcome this obstacle, we have proposed a physical model for spin-polarized electron transport through a chiral molecule based on the chiral-induced spin selectivity. Because the transport in the chiral molecule is not an isolated one. but rather an electron coupled to its surrounding lattice distortions, namely, a spatial localized polaron, an indispensable polaron effect is incorporated in our model. We show that the polaron transport through the chiral molecule exhibits a spin-momentum-locked feature. Interestingly, no matter what their initial spin state is. all of the polarons could transmit through the molecule with their spins being aligned to the same orientation due to the effective "inverse Faraday effect." The coexistence of the electron-lattice coupling and SOC results in the spin and lattice being coupled, which leads to a strongly enhanced spin coherence and then a very high spin polarization of 70%. In addition, the effects of the helix pitch, polaron size, and drift velocity on spin polarization are also discussed. Our results open the possibility of using chiral molecules in spintronics applications and offer a paradigm for information processing and transmission.
机译：有机材料中的弱超细相互作用和旋转轨道耦合（SoC）导致长自旋寿命，这对于闪蒸的寿命非常有前途。另一方面，它们还使其挑战实现自旋极化，这对于闪铜器装置来说至关重要。为了克服这种障碍，我们提出了一种基于手性诱导的旋转选择性穿过手性分子的旋转偏振电子传输的物理模型。因为手性分子中的运输不是分离的。而是耦合到其周围的晶格畸变的电子，即空间局部化的极化子，在我们的模型中结合了不可或缺的极化效果。我们表明，通过手性分子的极化子传输表现出旋转动量锁定的特征。有趣的是，无论他们的初始自旋状态是什么。所有极化子都可以通过分子传递它们的旋转由于有效的“反向法拉第效应而与相同的取向对齐。电子晶格耦合和SOC的共存导致旋转和晶格耦合，这导致强大的旋转相干性，然后是70％的非常高的自旋极化。另外，还讨论了螺旋间距，极化尺寸和漂移速度对自旋极化的影响。我们的结果开启了使用闪铜器应用中的手性分子的可能性，并提供了用于信息处理和传输的范例。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214303.1-214303.6|共6页
  • 作者

    Longlong Zhang; Yuying Hao; Wei Qin; Shijie Xie; Fanyao Qu;

  • 作者单位

    College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China;

    College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China;

    School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China;

    School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China;

    Institute of Physics International Center for Condensed Matter Physics University of Brasilia Brasilia 70919-970 Brazil;

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