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arXiv 1709.04087cond-mat.mes-hall
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通过自旋相关的原子间跳跃实现的巨Rashba型自旋劈裂

Giant Rashba-type spin splitting through spin-dependent interatomic-hopping

Jisook Hong, Jun-Won Rhim, Inkyung Song, Changyoung Kim, Seung Ryong Park, Ji Hoon Shim

摘要:

我们采用密度泛函理论计算和紧束缚分析研究了Bi/Ag(111)中观察到的巨大Rashba型自旋分裂(RSS)的机制.我们发现,局域轨道角动量诱导动量和自旋相关的电荷分布,导致自旋相关的跳跃。研究表明,Bi/Ag(111)中自旋相关的原子间跃迁作为一个强有效场,诱导了巨RSS,表明巨RSS是由跃迁驱动的,而不是由均匀电场驱动的.跳跃能量差的有效场为~18 V/cm。RSS的这种新的视角给了我们一个提示,一般的巨型RSS机制,并应提供一种策略,通过控制相邻原子层之间的跳跃能量的自旋依赖性设计新的RSS材料。

英文摘要:

We have performed density functional theory calculation and tight binging analysis in order to investigate the mechanism for the giant Rashba-type spin splitting (RSS) observed in Bi/Ag(111). We find that local orbital angular momentum induces momentum and spin dependent charge distribution which results in spin-dependent hopping. We show that the spin-dependent interatomic-hopping in Bi/Ag(111) works as a strong effective field and induces the giant RSS, indicating that the giant RSS is driven by hopping, not by a uniform electric field. The effective field from the hopping energy difference amounts to be ~18 V/Å. This new perspective on the RSS gives us a hint for the giant RSS mechanism in general and should provide a strategy for designing new RSS materials by controlling spin-dependence of hopping energy between the neighboring atomic layers.

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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