凝聚态物理
石墨烯
铁磁性
塞曼效应
费米能量
自旋极化
量子隧道
物理
费米能级
极化(电化学)
塞曼能源
自旋(空气动力学)
电导
磁场
电子
量子力学
热力学
物理化学
化学
作者
Jianlong Zheng,Junqiang Lu,Feng Zhai
出处
期刊:Physical review
[American Physical Society]
日期:2022-04-11
卷期号:105 (16)
被引量:2
标识
DOI:10.1103/physrevb.105.165410
摘要
We investigate valley-dependent electronic transport properties of graphene in close proximity to a thick ferromagnetic insulator (FI). It is found that spin-resolved valley filtering can be achieved under the interplay between the stray field emanated from the FI and the exchange-proximity interaction. In the intraband-tunneling regime, there exists a window of Fermi energy where both the spin and valley polarization of the output current are almost complete $(\ensuremath{\approx}\ensuremath{-}100%)$. In the interband-tunneling regime, the valley polarization can approach $100%$ or $\ensuremath{-}70%$ near some conductance peaks, while the spin polarization is near $100%$ in a wide window of Fermi energy. The role of valley-Zeeman coupling is examined for both cases. The spin-valley filtering is found to be tunable by electric gating. Our findings are helpful for designing a spin-valley filter based on graphene with imprinted ferromagnetism.
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