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arXiv 2305.18751cond-mat.mes-hall
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有限$p$轨道螺旋原子链边缘的电子与自旋态

Electronic and Spin States at Edges of Finite $p$-orbital Helical Atomic Chain

Takemitsu Kato, Yasuhiro Utsumi, Ora Entin-Wohlman, Amnon Aharony

AI总结:

该研究理论分析有限$p$轨道螺旋原子链边缘的电子与自旋态,揭示自旋过滤态及塞曼场诱导的自旋极化,其方向依赖分子手性,为CISS效应及对映选择性吸附提供见解。

摘要:

针对手性诱导自旋选择性(CISS)效应,我们从理论上分析了具有原子内自旋轨道相互作用(SOI)的有限$p$轨道螺旋原子链边缘的电子与自旋态。该模型可以承载自旋过滤态,其中两个上自旋沿一个方向传播,两个下自旋沿相反方向传播,且不破坏时间反演对称性。由于倏逝态,集中在边缘的电荷调制得到增强,尽管由于时间反演对称性(TRS)而不存在自旋密度。原子链边缘处的塞曼场破坏了TRS,产生有限的自旋极化,其方向取决于分子的手性。手性变化引起合理的能量差异,这可能为手性分子在铁磁表面的对映选择性吸附提供见解。

英文摘要:

In connection to the chiral-induced spin-selectivity (CISS) effect, we theoretically analyze the electronic and spin states of edges of a finite $p$-orbital helical atomic chain with the intra-atomic spin-orbit interaction (SOI). This model can host the spin-filtering state in which two up spins propagate in one direction and two down spins propagate in the opposite direction without breaking the time-reversal symmetry. The enhancement of charge modulations concentrated at the edges due to the evanescent states is induced, although the spin density is absent because of the time-reversal symmetry (TRS). A Zeeman field at an edge of the atomic chain, which breaks the TRS, yields a finite spin polarization, whose direction depends on the chirality of the molecule. The chirality change induces a reasonable amount of the energy difference, which may provide an insight into the enantioselective adsorption of chiral molecules on the ferromagnetic surface.

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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