Quantum transport through a graphene nanoribbon-superconductor junction

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	Quantum transport through a graphene nanoribbon-superconductor junction
	Sun, QF ; Xie, XC
刊名	JOURNAL OF PHYSICS-CONDENSED MATTER
	2009
卷号	21 期号:34
关键词	ANDREEV REFLECTION SCHEME SYSTEM PHASE
ISSN号	0953-8984
通讯作者	Sun, QF (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	We study the electron transport through a graphene nanoribbon-superconductor junction. Both zigzag and armchair edge graphene nanoribbons are considered, and the effects of the magnetic field and disorder on the transport property are investigated. By using the tight-binding model and the non-equilibrium Green's function method, the expressions of the current, conductance, normal tunneling coefficient and Andreev reflection coefficient are obtained. For a clean system and at zero magnetic field, the linear conductance increases approximately in a linear fashion with the on-site energy. In the presence of a magnetic field and a moderate disorder, the linear conductance exhibits plateau structures for both armchair and zigzag edges. The plateau values increase with the width of the graphene ribbon. With a wide sample width, a saturated plateau value of vertical bar nu vertical bar e(2)/h emerges at the filling factor nu. For a small filling factor, the conductance can reach the saturated value at a small width, but for a high filling factor it requires to have a quite wide sample width to reach the saturated value. In particular, the Andreev reflection coefficient is always at 0.5 after reaching the saturated value, independent of any system parameters. In addition, we also consider the finite bias case, in which the Andreev reflection coefficient and normal tunneling coefficient are studied.
收录类别	SCI
资助信息	NSFChina [10525418, 10734110]; US-DOE [DE-FG02-04ER46124]; US-NSF
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51758]
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	Sun, QF,Xie, XC. Quantum transport through a graphene nanoribbon-superconductor junction[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2009,21(34).
APA	Sun, QF,&Xie, XC.(2009).Quantum transport through a graphene nanoribbon-superconductor junction.JOURNAL OF PHYSICS-CONDENSED MATTER,21(34).
MLA	Sun, QF,et al."Quantum transport through a graphene nanoribbon-superconductor junction".JOURNAL OF PHYSICS-CONDENSED MATTER 21.34(2009).