Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy

被引：42

作者：

Deshpande, A. ^{[1
]}

Bao, W. ^{[2
]}

Zhao, Z. ^{[2
]}

Lau, C. N. ^{[2
]}

LeRoy, B. J. ^{[1
]}

机构：

[1] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[2] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 15期

基金：

美国国家科学基金会;

关键词：

HIGH-QUALITY; FILMS;

D O I：

10.1103/PhysRevB.83.155409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using scanning tunneling microscopy (STM), we have imaged local charge density fluctuations in monolayer graphene. By placing a small gold nanoparticle on the end of the STM tip, a charge sensor is created. By raster scanning the tip over the surface and using Coulomb blockade spectroscopy, we map the local potential on the graphene. We observe a series of electron and hole doped puddles with a characteristic length scale of similar to 20 nm. Theoretical calculations for the correlation length of the puddles based on the number of impurities are in agreement with our measurements.

引用

收藏

页数：5

相关论文

共 24 条

[1] A self-consistent theory for graphene transport [J].

Adam, Shaffique ;

Hwang, E. H. ;

Galitski, V. M. ;

Das Sarma, S. .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2007, 104 (47) :18392-18397

[2]

Bae S, 2010, NAT NANOTECHNOL, V5, P574, DOI [10.1038/nnano.2010.132, 10.1038/NNANO.2010.132]

[3] Lithography-free fabrication of high quality substrate-supported and freestanding graphene devices [J].

Bao, Wenzhong ;

Liu, Gang ;

Zhao, Zeng ;

Zhang, Hang ;

Yan, Dong ;

Deshpande, Aparna ;

LeRoy, Brian J. ;

Lau, Chun Ning .

NANO RESEARCH, 2010, 3 (02) :98-102

[4] Electronic confinement and coherence in patterned epitaxial graphene [J].

Berger, Claire ;

Song, Zhimin ;

Li, Xuebin ;

Wu, Xiaosong ;

Brown, Nate ;

Naud, Cecile ;

Mayou, Didier ;

Li, Tianbo ;

Hass, Joanna ;

Marchenkov, Atexei N. ;

Conrad, Edward H. ;

First, Phillip N. ;

de Heer, Wait A. .

SCIENCE, 2006, 312 (5777) :1191-1196

[5] The electronic properties of graphene [J].

Castro Neto, A. H. ;

Guinea, F. ;

Peres, N. M. R. ;

Novoselov, K. S. ;

Geim, A. K. .

REVIEWS OF MODERN PHYSICS, 2009, 81 (01) :109-162

[6] High-Fidelity Conformation of Graphene to SiO2 Topographic Features [J].

Cullen, W. G. ;

Yamamoto, M. ;

Burson, K. M. ;

Chen, J. H. ;

Jang, C. ;

Li, L. ;

Fuhrer, M. S. ;

Williams, E. D. .

PHYSICAL REVIEW LETTERS, 2010, 105 (21)

[7] Spatially resolved spectroscopy of monolayer graphene on SiO2 [J].

Deshpande, A. ;

Bao, W. ;

Miao, F. ;

Lau, C. N. ;

LeRoy, B. J. .

PHYSICAL REVIEW B, 2009, 79 (20)

[8] EFFECT OF THE ELECTROMAGNETIC ENVIRONMENT ON THE COULOMB BLOCKADE IN ULTRASMALL TUNNEL-JUNCTIONS [J].

DEVORET, MH ;

ESTEVE, D ;

GRABERT, H ;

INGOLD, GL ;

POTHIER, H ;

URBINA, C .

PHYSICAL REVIEW LETTERS, 1990, 64 (15) :1824-1827

[9] Graphene: Status and Prospects [J].

Geim, A. K. .

SCIENCE, 2009, 324 (5934) :1530-1534

[10] Intrinsic and extrinsic corrugation of monolayer graphene deposited on SiO2 [J].

Geringer, V. ;

Liebmann, M. ;

Echtermeyer, T. ;

Runte, S. ;

Schmidt, M. ;

Rueckamp, R. ;

Lemme, M. C. ;

Morgenstern, M. .

PHYSICAL REVIEW LETTERS, 2009, 102 (07)