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arXiv 2005.06770cond-mat.mtrl-scicond-mat.mes-hall
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利用work function差分控制Pb沉积石墨烯的Dirac带态

Controlling of the Dirac band states of Pb-deposited graphene by using work function difference

Y. Tsujikawa, M. Sakamoto, Y. Yokoi, M. Imamura, K. Takahashi, R. Hobara, T. Uchihashi, A. Takayama

摘要:

利用扫描隧道显微镜(STM)和角分辨光电子能谱(ARPES)研究了Pb沉积量对SiC(0001)衬底上双层石墨烯(BLG)电子结构的影响。通过STM观察到Pb原子形成岛,通过ARPES观察到BLG的$π$带向费米能级移动。这种空穴掺杂样的能量转移是增强的Pb的量的增加,我们能够调整狄拉克间隙的费米能级的4 ML沉积。考虑到能带色散,我们认为类空穴掺杂效应与Pb岛和BLG/SiC的功函数的差异有关,BLG/SiC的功函数低于Pb的功函数。我们的研究结果提出了一种简单的方法,带调谐石墨烯与适当选择的衬底和沉积材料。

英文摘要:

We have performed scanning tunneling microscope (STM) and angle-resolved photoemission spectroscopy (ARPES) in Pb-deposited bilayer Graphene (BLG) on SiC(0001) substrate to investigate the dependence of the electronic structures on Pb-deposition amount. We have observed that the Pb atoms form islands by STM and the $π$ bands of the BLG shift toward the Fermi level by ARPES. This hole-doping-like energy shift is enhanced as the amount of Pb is increased, and we were able to tune the Dirac gap to the Fermi level by 4 ML deposition. Considering the band dispersion, we suggest that hole-doping-like effect is related to the difference between the work functions of Pb islands and BLG/SiC; the work function of BLG/SiC is lower than that of Pb. Our results propose an easy way of band tuning for graphene with appropriate selection of both the substrate and deposited material.

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