Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures

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	Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures
	Chen, ZG ; Shi, ZW ; Yang, W ; Lu, XB ; Lai, Y ; Yan, HG ; Wang, F ; Zhang, GY ; Li, ZQ
刊名	NATURE COMMUNICATIONS
	2014
卷号	5
ISSN号	2041-1723
通讯作者	Li, ZQ (reprint author), Natl High Magnet Field Lab, Tallahassee, FL 32310 USA.
中文摘要	Van der Waals heterostructures formed by assembling different two-dimensional atomic crystals into stacks can lead to many new phenomena and device functionalities. In particular, graphene/boron-nitride heterostructures have emerged as a very promising system for band engineering of graphene. However, the intrinsic value and origin of the bandgap in such heterostructures remain unresolved. Here we report the observation of an intrinsic bandgap in epitaxial graphene/boron-nitride heterostructures with zero crystallographic alignment angle. Magneto-optical spectroscopy provides a direct probe of the Landau level transitions in this system and reveals a bandgap of similar to 38 meV (440 K). Moreover, the Landau level transitions are characterized by effective Fermi velocities with a critical dependence on specific transitions and magnetic field. These findings highlight the important role of many-body interactions in determining the fundamental properties of graphene heterostructures.
资助信息	User Collaboration Grants Programme at the National High Magnetic Field Laboratory; Office of Basic Energy Science, Department of Energy [DE-SC0003949, DE-AC02-05CH11231]; National Basic Research Program of China (973 Program) [2013CB934500]; National Science Foundation of China (NSFC) [61325021, 91223204]; Chinese Academy of Sciences; National Science Foundation Cooperative Agreement [DMR-1157490]; State of Florida; US Department of Energy
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59383]
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	Chen, ZG,Shi, ZW,Yang, W,et al. Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures[J]. NATURE COMMUNICATIONS,2014,5.
APA	Chen, ZG.,Shi, ZW.,Yang, W.,Lu, XB.,Lai, Y.,...&Li, ZQ.(2014).Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures.NATURE COMMUNICATIONS,5.
MLA	Chen, ZG,et al."Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures".NATURE COMMUNICATIONS 5(2014).