Effects of Metallic Contacts on Electron Transport through Graphene

被引：134

作者：

Barraza-Lopez, Salvador ^{[1
]}

Vanevic, Mihajlo ^{[1
,2
]}

Kindermann, Markus ^{[1
]}

Chou, M. Y. ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[2] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 07期

基金：

美国国家科学基金会;

关键词：

DEVICES;

D O I：

10.1103/PhysRevLett.104.076807

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on a first-principles study of the conductance through graphene suspended between Al contacts as a function of junction length, width, and orientation. The charge transfer at the leads and into the freestanding section gives rise to an electron-hole asymmetry in the conductance and in sufficiently long junctions induces two conductance minima at the energies of the Dirac points for suspended and clamped regions, respectively. We obtain the potential profile along a junction caused by doping and provide parameters for effective model calculations of the junction conductance with weakly interacting metallic leads.

引用

页数：4

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