Modulation of Fermi velocities of Dirac electrons in single layer graphene by moire superlattice

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	Modulation of Fermi velocities of Dirac electrons in single layer graphene by moire superlattice
	Zou, Q ; Belle, BD ; Zhang, LZ ; Xiao, WD ; Yang, K ; Liu, LW ; Wang, GQ ; Fei, XM ; Huang, Y ; Ma, RS ; Lu, Y ; Tan, PH ; Guo, HM ; Du, SX ; Gao, HJ
刊名	APPLIED PHYSICS LETTERS
	2013
卷号	103 期号:11
ISSN号	0003-6951
通讯作者	Zou, Q (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	Study of electronic properties of graphene on an anisotropic crystal substrate including boron nitride (BN) has raised significant interest recently due to the application of graphene based vertical hetero-devices. We have performed scanning tunneling microscopy (STM) and scanning tunneling spectroscopy studies of single-layer graphene on hexagonal BN (h-BN) substrates with an applied perpendicular magnetic field at low temperature. Different periodic moire superlattices can be resolved with STM, and their quantized Landau levels in high magnetic field are investigated. The renormalized Fermi velocities of massless Dirac fermions in graphene are revealed to show dependent on the moire superlattice. Density functional theory calculation verifies that the interlayer interaction between graphene and h-BN is stronger with smaller twisting angle between lattices of graphene and h-BN, thus, leading to a reduction in the velocity of charge carriers. Our results should provide valuable insight of electronic properties and device performance of graphene on crystal substrates. (C) 2013 AIP Publishing LLC.
资助信息	National Science Foundation of China [61274011, 51210003]; National "973" projects of China [2009CB929103, 2010CB923004, 2011CB932700]; Chinese Academy of Sciences; SSC; National "973" project of China [2009CB929301]; NSFC [11225421]; EPSRC of UK
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57224]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zou, Q,Belle, BD,Zhang, LZ,et al. Modulation of Fermi velocities of Dirac electrons in single layer graphene by moire superlattice[J]. APPLIED PHYSICS LETTERS,2013,103(11).
APA	Zou, Q.,Belle, BD.,Zhang, LZ.,Xiao, WD.,Yang, K.,...&Gao, HJ.(2013).Modulation of Fermi velocities of Dirac electrons in single layer graphene by moire superlattice.APPLIED PHYSICS LETTERS,103(11).
MLA	Zou, Q,et al."Modulation of Fermi velocities of Dirac electrons in single layer graphene by moire superlattice".APPLIED PHYSICS LETTERS 103.11(2013).