Chirality-Induced Propagation Velocity Asymmetry,Nano Letters

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Chirality-Induced Propagation Velocity Asymmetry
Nano Letters ( IF 9.6 ) Pub Date : 2021-09-22 , DOI: 10.1021/acs.nanolett.1c02636
Diego A Hoff ₁ , Luis G C Rego ₂

Affiliation

The spin-dependent propagation of electrons in helical nanowires is investigated. We show that the interplay of spin angular momentum and nanowire chirality, under spin–orbit interaction, lifts the symmetry between left and right propagating electrons, giving rise to a velocity asymmetry. The study is based on a microscopic tight-binding model that takes into account the spin–orbit interaction. The continuity equation for the spin-dependent probability density is derived, including the spin nonconserving terms, and quantum dynamics calculations are performed to obtain the electron propagation dynamics. The calculations are applied to the inorganic double-helix SnIP, a quasi-1D material that constitutes a semiconductor with a band gap of ∼1.9 eV. The results, nevertheless, have general validity due to symmetry considerations. The relation of the propagation velocity asymmetry with the phenomena ascribed to the chiral-induced spin selectivity effect is examined.

中文翻译：

手性引起的传播速度不对称

研究了螺旋纳米线中电子的自旋相关传播。我们表明，自旋角动量和纳米线手性的相互作用，在自旋轨道相互作用下，提升了左右传播电子之间的对称性，导致速度不对称。该研究基于考虑自旋轨道相互作用的微观紧束缚模型。推导出自旋相关概率密度的连续性方程，包括自旋非守恒项，并进行量子动力学计算以获得电子传播动力学。计算应用于无机双螺旋 SnIP，这是一种准一维材料，构成带隙约为 1.9 eV 的半导体。然而，由于对称性考虑，结果具有普遍的有效性。

更新日期：2021-10-13

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