Charged impurity scattering in bilayer graphene

被引：88

作者：

Xiao, Shudong ^{[1
,2
]}

Chen, Jian-Hao ^{[1
,2
]}

Adam, Shaffique ^{[1
,3
]}

Williams, Ellen D. ^{[1
,2
]}

Fuhrer, Michael S. ^{[1
,2
]}

机构：

[1] Univ Maryland, Ctr Nanophys & Adv Mat, College Pk, MD 20742 USA

[2] Univ Maryland, Mat Res Sci & Engn Ctr, College Pk, MD 20742 USA

[3] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 04期

关键词：

BERRYS PHASE; TRANSPORT; SIO2;

D O I：

10.1103/PhysRevB.82.041406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have examined the impact of charged impurity scattering on charge carrier transport in bilayer graphene (BLG) by deposition of potassium in ultrahigh vacuum at low temperature. Charged impurity scattering gives a conductivity which is supralinear in carrier density with a magnitude similar to single-layer graphene for the measured range of carrier densities of 2-4 x 10(12) cm(-2). Upon addition of charged impurities of concentration n(imp), the minimum conductivity sigma(min) decreases proportional to n(imp)(-1/2) while the electron and hole puddle carrier density increases proportional to n(imp)(1/2). These results for the intentional deposition of potassium on BLG are consistent with theoretical predictions for charged impurity scattering assuming a gapless hyperbolic dispersion relation. However, our results also suggest that charged impurity scattering alone cannot explain the observed transport properties of pristine BLG on SiO(2) before potassium doping.

引用

页数：4

共 27 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] Boltzmann transport and residual conductivity in bilayer graphene [J].

Adam, Shaffique ;

Das Sarma, S. .

PHYSICAL REVIEW B, 2008, 77 (11)

[3] Screening effect and impurity scattering in monolayer graphene [J].

Ando, Tsuneya .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2006, 75 (07)

[4] Alkali metal adsorption on graphite: a review [J].

Caragiu, M ;

Finberg, S .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (35) :R995-R1024

[5] Charged-impurity scattering in graphene [J].

Chen, J. -H. ;

Jang, C. ;

Adam, S. ;

Fuhrer, M. S. ;

Williams, E. D. ;

Ishigami, M. .

NATURE PHYSICS, 2008, 4 (05) :377-381

[6] Diffusive charge transport in graphene on SiO2 [J].

Chen, J. -H. ;

Jang, C. ;

Ishigami, M. ;

Xiao, S. ;

Cullen, W. G. ;

Williams, E. D. ;

Fuhrer, M. S. .

SOLID STATE COMMUNICATIONS, 2009, 149 (27-28) :1080-1086

[7] Theory of carrier transport in bilayer graphene [J].

Das Sarma, S. ;

Hwang, E. H. ;

Rossi, E. .

PHYSICAL REVIEW B, 2010, 81 (16)

[8]

DASSARMA S, COMMUNICATION

[9] Raman spectrum of graphene and graphene layers [J].

Ferrari, A. C. ;

Meyer, J. C. ;

Scardaci, V. ;

Casiraghi, C. ;

Lazzeri, M. ;

Mauri, F. ;

Piscanec, S. ;

Jiang, D. ;

Novoselov, K. S. ;

Roth, S. ;

Geim, A. K. .

PHYSICAL REVIEW LETTERS, 2006, 97 (18)

[10] Carrier transport in two-dimensional graphene layers [J].

Hwang, E. H. ;

Adam, S. ;

Das Sarma, S. .

PHYSICAL REVIEW LETTERS, 2007, 98 (18)

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