Spin polarization of single-layer graphene epitaxially grown on Ni(1 1 1) thin film
Spin polarization of single-layer graphene epitaxially grown on Ni(1 1 1) thin film
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DOI：
10.1016/j.carbon.2013.04.077
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发表时间：
2013-09
期刊：
影响因子：
10.9
通讯作者：
S. Entani;M. Kurahashi;Xia Sun;Y. Yamauchi
中科院分区：
文献类型：
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作者：
S. Entani;M. Kurahashi;Xia Sun;Y. Yamauchi
利用自旋极化亚稳去激发谱（SPMDS）研究了Ni（111）表面石墨烯的自旋分辨电子结构.采用超高真空化学气相沉积技术，以苯蒸气为前驱体，在Ni（111）单晶表面外延生长了石墨烯。在50 L（5×10− 5 Torrs）下，形成了石墨烯的单一外延层，但在更高的曝光下没有观察到进一步的生长。石墨烯/Ni（111）的自旋和谱在费米能级处有一个新的峰，并有三个弱的特征对应于石墨烯的分子轨道。SPMDS谱的自旋不对称性分析表明，新峰所示的电子态的自旋极化平行于Ni衬底的大多数自旋。从石墨烯π轨道和Ni d轨道的杂化角度讨论了新电子态的出现和自旋极化.
The spin-resolved electronic structure of graphene on Ni(111) was investigated using spin-polarized metastable deexcitation spectroscopy (SPMDS). Graphene was grown epitaxially on a Ni(111) single-crystalline surface using the ultra high vacuum chemical vapor deposition technique with benzene vapor as a precursor. At 50L (5×10−5Torrs), a single epitaxial layer of graphene was formed, but no further growth was observed at higher exposure. The spin-summed spectrum of graphene/Ni(111) had a new peak at the Fermi level and three weak features corresponding to the molecular orbitals of graphene. Spin asymmetry analysis of the SPMDS spectra revealed that the spin polarization of the electronic states shown by the new peak was parallel to the majority spin of the Ni substrate. The appearance and spin polarization of the new electronic states are discussed in terms of the hybridization of graphene π orbitals and Ni d orbitals.