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Nonvolatile tuning of the spin–orbit coupling in graphene by a ferroelectric dipole
Applied Physics Letters ( IF 4 ) Pub Date : 2020-11-16 , DOI: 10.1063/5.0030149
Jungmin Park 1 , Jonghyeon Choi 2 , Inseon Oh 2 , Ah-Yeon Lee 3 , Chang Won Ahn 4 , Seulgi Koo 5 , Jung-Woo Yoo 2 , Younghun Jo 1
Affiliation  

Spin–orbit coupling (SOC) offers an alternative technique for generating pure spin currents in non-magnetic materials and controlling spin precessions for spin-field effect transistors. In addition, introducing SOC into graphene causes pristine graphene to evolve into a new condensed matter phase, such as the topological insulator state (quantum spin Hall state). Thus, the control of SOC in graphene is essential for its functional spin-orbitronic applications. Here, we report the nonvolatile tuning of SOC in graphene through the proximity effect from a ferroelectric substrate, Pb(Zr52,Ti48)O3 (PZT). Ferroelectric poling by applying a gate voltage induces a change in the SOC strength in addition to shifting the charge neutral point in graphene. The variations in SOC were extracted from weak localization within the quantum interference theory of graphene. Our analyses show that the dipole moments from the PZT polarization significantly enhance the z → −z asymmetric and symmetric SOCs of graphene. Unlike the impurity doping and/or gating, our methodology leads to the nonvolatile electrical control of SOC, thereby paving the way for versatile spin-orbitronic applications of graphene.

中文翻译:

通过铁电偶极子对石墨烯中的自旋轨道耦合进行非易失性调谐

自旋轨道耦合 (SOC) 为在非磁性材料中产生纯自旋电流和控制自旋场效应晶体管的自旋进动提供了一种替代技术。此外,将SOC引入石墨烯会导致原始石墨烯演化为新的凝聚态相,例如拓扑绝缘体态(量子自旋霍尔态)。因此,石墨烯中 SOC 的控制对其功能性自旋轨道电子应用至关重要。在这里,我们报告了通过铁电衬底 Pb(Zr52,Ti48)O3 (PZT) 的邻近效应对石墨烯中 SOC 的非易失性调整。除了移动石墨烯中的电荷中性点外,通过施加栅极电压进行铁电极化还会引起 SOC 强度的变化。SOC 的变化是从石墨烯量子干涉理论中的弱定域中提取的。我们的分析表明,来自 PZT 极化的偶极矩显着增强了石墨烯的 z → -z 不对称和对称 SOC。与杂质掺杂和/或门控不同,我们的方法导致 SOC 的非易失性电控制,从而为石墨烯的多功能自旋轨道电子应用铺平了道路。
更新日期:2020-11-16
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