Collaborative Innovation Center of Quantum Matter , Beijing 100871, People's Republic of China.
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, People's Republic of China.
ACS Nano. 2016 Aug 23;10(8):7550-7. doi: 10.1021/acsnano.6b02548. Epub 2016 Aug 5.
The structural and electronic properties of monolayer graphene synthesized on a periodically reconstructed substrate can be widely modulated by the generation of superstructure patterns, thereby producing interesting physical properties, such as magnetism and superconductivity. Herein, using a facile chemical vapor deposition method, we successfully synthesized high-quality monolayer graphene with a uniform thickness on Au foils. The hex-reconstruction of Au(001), which is characterized by striped patterns with a periodicity of 1.44 nm, promoted the formation of a quasi-one-dimensional (1D) graphene superlattice, which served as a periodic quasi-1D modulator for the graphene overlayer, as evidenced by scanning tunneling microscopy/spectroscopy. Intriguingly, two new Dirac points were generated for the quasi-1D graphene superlattice located at -1.73 ± 0.02 and 1.12 ± 0.12 eV. Briefly, this work demonstrates that the periodic modulation effect of reconstructed metal substrates can dramatically alter the electronic properties of graphene and provides insight into the modulation of these properties using 1D potentials.
在周期性重构衬底上合成的单层石墨烯的结构和电子特性可以通过超结构图案的产生得到广泛调节，从而产生有趣的物理特性，如磁性和超导性。在此，我们使用一种简便的化学气相沉积方法，成功地在 Au 箔上合成了具有均匀厚度的高质量单层石墨烯。Au(001)的六方重构，其特征是具有 1.44nm 周期性的条纹图案，促进了准一维（1D）石墨烯超晶格的形成，作为石墨烯覆盖层的周期性准 1D 调制器，这一点通过扫描隧道显微镜/光谱得到了证明。有趣的是，对于位于-1.73±0.02 和 1.12±0.12eV 的准 1D 石墨烯超晶格，产生了两个新的狄拉克点。简而言之，这项工作表明重构金属衬底的周期性调制效应可以显著改变石墨烯的电子特性，并为使用 1D 势对这些特性进行调制提供了思路。
