A self-consistent theory for graphene transport

被引：1003

作者：

Adam, Shaffique ^{[1
]}

Hwang, E. H. ^{[1
]}

Galitski, V. M. ^{[1
]}

Das Sarma, S. ^{[1
]}

机构：

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

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2007年 / 104卷 / 47期

关键词：

Boltzmann transport; electron transport; minimum conductivity;

D O I：

10.1073/pnas.0704772104

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We demonstrate theoretically that most of the observed transport properties of graphene sheets at zero magnetic field can be explained by scattering from charged impurities. We find that, contrary to common perception, these properties are not universal but depend on the concentration of charged impurities nimp. For dirty samples (250 x 10(10) cm(-2) < n(imp) < 400 x 10(10) cm(-2)), the value of the minimum conductivity at low carrier density is indeed 4e(2)/h in agreement with early experiments, with weak dependence on impurity concentration. For cleaner samples, we predict that the minimum conductivity depends strongly on n(imp), increasing to 8e(2)/h for n(imp) approximate to 20 x 10(10) cm(-2). A clear strategy to improve graphene mobility is to eliminate charged impurities or use a substrate with a larger dielectric constant.

引用

页码：18392 / 18397

页数：6

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