nn6b02548_si_001.pdf (1.8 MB)
Modulating the Electronic Properties of Monolayer Graphene Using a Periodic Quasi-One-Dimensional Potential Generated by Hex-Reconstructed Au(001)
journal contribution
posted on 2016-08-01, 00:00 authored by Xiebo Zhou, Yue Qi, Jianping Shi, Jingjing Niu, Mengxi Liu, Guanhua Zhang, Qiucheng Li, Zhepeng Zhang, Min Hong, Qingqing Ji, Yu Zhang, Zhongfan Liu, Xiaosong Wu, Yanfeng ZhangThe 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.