Spatially resolving density-dependent screening around a single charged atom in graphene

被引：20

作者：

Wong, Dillon ^{[1
,2
]}

Corsetti, Fabiano ^{[3
,4
]}

Wang, Yang ^{[1
,2
]}

Brar, Victor W. ^{[1
,2
]}

Tsai, Hsin-Zon ^{[1
,2
]}

Wu, Qiong ^{[1
,2
]}

Kawakami, Roland K. ^{[5
,6
]}

Zettl, Alex ^{[1
,2
,7
,8
]}

Mostofi, Arash A. ^{[3
,4
]}

Lischner, Johannes ^{[3
,4
]}

Crommie, Michael F. ^{[1
,2
,7
,8
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Imperial Coll London, Dept Mat & Phys, London SW7 2AZ, England

[4] Imperial Coll London, Thomas Young Ctr Theory & Simulat Mat, London SW7 2AZ, England

[5] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[6] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[7] Univ Calif Berkeley, Kavli Energy NanoSci Inst, Berkeley, CA 94720 USA

[8] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 20期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

DIRAC FERMIONS; HIGH-QUALITY; IMPURITY;

D O I：

10.1103/PhysRevB.95.205419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrons in two-dimensional graphene sheets behave as interacting chiral Dirac fermions and have unique screening properties due to their symmetry and reduced dimensionality. By using a combination of scanning tunneling spectroscopy measurements and theoretical modeling we have characterized how graphene's massless charge carriers screen individual charged calcium atoms. A backgated graphene device configuration has allowed us to directly visualize how the screening length for this system can be tuned with carrier density. Our results provide insight into electron-impurity and electron-electron interactions in a relativistic setting with important consequences for other graphene-based electronic devices.

引用

页数：7

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