Conversion between spin and charge currents in topological-insulator/nonmagnetic-metal systems
Conversion between spin and charge currents in topological-insulator/nonmagnetic-metal systems
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拓扑绝缘体/非磁性金属系统中自旋电流和充电电流之间的转换
DOI：
10.1103/physrevb.104.l220407
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发表时间：
2021
影响因子：
3.7
通讯作者：
Wong, Kin
中科院分区：
文献类型：
--
作者：
He, Haoran;Tai, Lixuan;Wu, Hao;Wu, Di;Razavi, Armin;Gosavi, Tanay A.;Walker, Emily S.;Oguz, Kaan;Lin, Chia-Ching;Wong, Kin
拓扑绝缘体（TI）中的电荷电流将引起自旋累积（埃德尔斯坦效应或EE），由此将产生自旋电流。因此，自旋电流注入到TI中将引起称为逆埃德尔斯坦效应（IEE）的电荷电流。一些实验和理论工作已经做了对EE或IEE的理解。然而，很少有实验工作，将这两个过程在同一个TI样品已经完成。在这项工作中，我们提出了一个现象学模型来理解EE和IEE在TI为基础的系统。基于该模型，可以直接推导出电子效率和电子间效率，这与前人基于玻尔兹曼输运理论的理论工作一致，且符合能量守恒定律。我们还测量EE和IEE效率实验在TI/Ru/CoFeB系统的自旋力矩铁磁共振和自旋泵，分别。实验结果与我们的模型一致，证明了TI中的自旋-电荷转换可以用（I）EE而不是（逆）自旋霍尔效应的框架来理解。通过理论和实验相结合，我们发现，提高界面透明度是提高效率的关键，避免金属接触是提高IEE效率的关键。
The charge current in a topological insulator (TI) will induce a spin accumulation (Edelstein effect or EE), from which the spin current will be generated. Inversely, the spin current injection into the TI will induce a charge current called the inverse Edelstein effect (IEE). Some experimental and theoretical works have been done for the understanding of either EE or IEE. However, little experimental work incorporating both processes in the same TI sample has been done. In this work, we propose a phenomenological model to understand EE and IEE in the TI-based system. Based on this model, efficiencies of EE and IEE can be directly derived, which is consistent with previous theoretical work based on Boltzmann transport theory and obeying the energy conservation law. We also measure EE and IEE efficiencies experimentally in a TI/Ru/CoFeB system by spin-torque ferromagnetic resonance and spin pumping, respectively. The experimental results are consistent with our model, which proves that the spin-charge conversion in TI can be understood in the framework of (I)EE instead of (inverse) spin Hall effect. By combining theories and experiments, we find that enhancing interfacial transparency is crucial for enhancing EE efficiency, and avoiding metallic contact is crucial for enhancing IEE efficiency.
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影响因子：
64.8
作者：
Noel, Paul;Trier, Felix;Attane, Jean-Philippe
通讯作者：
Attane, Jean-Philippe
由于非磁性金属/氧化铟锡界面的快速自旋喷射，有效产生自旋电流并抑制磁阻尼
影响因子：
6.1
作者：
K. Kondou;Hanshen Tsai;H. Isshiki;Y. Otani
通讯作者：
Y. Otani
影响因子：
6.1
作者：
He, Haoran;Tai, Lixuan;Wang, Kang L.
通讯作者：
Wang, Kang L.
影响因子：
13.6
作者：
Li, Peng;Kally, James;Wu, Mingzhong
通讯作者：
Wu, Mingzhong