Four-fold Raman enhancement of 2D band in twisted bilayer graphene: evidence for a doubly degenerate Dirac band and quantum interference

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	Four-fold Raman enhancement of 2D band in twisted bilayer graphene: evidence for a doubly degenerate Dirac band and quantum interference
	Wang, YN ; Su, ZH ; Wu, W ; Nie, S ; Lu, XH ; Wang, HY ; McCarty, K ; Pei, SS ; Robles-Hernandez, F ; Hadjiev, VG ; Bao, JM
刊名	NANOTECHNOLOGY
	2014
卷号	25 期号:33
关键词	twisted bilayer graphene Raman scattering quantum interference
ISSN号	0957-4484
通讯作者	Wang, YN (reprint author), Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA.
中文摘要	We report the observation of a strong 2D band Raman in twisted bilayer graphene (tBLG) with large rotation angles under 638 nm and 532 nm visible laser excitations. The 2D band Raman intensity increased four-fold as opposed to the two-fold increase observed in single-layer graphene. The same tBLG samples also exhibited rotation-dependent G-line resonances and folded phonons under 364 nm UV laser excitation. We attribute this 2D band Raman enhancement to the constructive interference between two double-resonance Raman pathways, which were enabled by a nearly degenerate Dirac band in the tBLG Moire superlattices.
资助信息	Office of Basic Energy Sciences, Division of Materials Sciences and Engineering of the US DOE [DE-AC04-94AL85000]; Delta Electronics Foundation; UH CAM; National Science Foundation [ECCS-1240510]; Robert A Welch Foundation [E-1728]; State of Texas through the Texas Center for Superconductivity at the University of Houston
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/311004/59370]
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	Wang, YN,Su, ZH,Wu, W,et al. Four-fold Raman enhancement of 2D band in twisted bilayer graphene: evidence for a doubly degenerate Dirac band and quantum interference[J]. NANOTECHNOLOGY,2014,25(33).
APA	Wang, YN.,Su, ZH.,Wu, W.,Nie, S.,Lu, XH.,...&Bao, JM.(2014).Four-fold Raman enhancement of 2D band in twisted bilayer graphene: evidence for a doubly degenerate Dirac band and quantum interference.NANOTECHNOLOGY,25(33).
MLA	Wang, YN,et al."Four-fold Raman enhancement of 2D band in twisted bilayer graphene: evidence for a doubly degenerate Dirac band and quantum interference".NANOTECHNOLOGY 25.33(2014).