Quasi-one-dimensional graphene superlattices formed on high-index surfaces, Phys. Rev. B 2014, 89, 085416
Quasi-one-dimensional graphene superlattices formed on high-index surfaces
Phys. Rev. B 89, 085416 – Published 19 February 2014
Chenfang Lin 1,*, Xiangqian Huang 1,* , Fen Ke 1,* , Chenhao Jin 1, Nai Tong 1, Xiuli Yin 1, Lin Gan 3, Xuefeng Guo 3,Ruguang Zhao 1, Weisheng Yang 1, Enge Wang 2,4, and Zonghai Hu 1,2,†
1State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
2Collaborative Innovation Center for Quantum Matter, Beijing, China
3College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
4International Center for Quantum Materials, School of Physics, Peking University, Beijing, China
*These authors contributed equally to this work.
†Corresponding author: zhhu@pku.edu.cn
ABSTRACT
We report preparation of large area quasi-one-dimensional (1D) monolayer graphene superlattices on a prototypical high-index surface Cu(410)-O and characterization by Raman spectroscopy, Auger electron spectroscopy, low-energy electron diffraction, scanning tunneling microscopy, and scanning tunneling spectroscopy. The periodically stepped substrate gives a 1D modulation to graphene, forming a superlattice of the same superperiodicity. Consequently, the moiré pattern is also quasi-1D, with a different periodicity. Scanning tunneling spectroscopy measurements revealed new Dirac points formed at the superlattice Brillouin zone boundary as predicted by theories.
