Universal conductance fluctuations in graphene

被引:57
作者
Kharitonov, Maxim Yu. [1 ]
Efetov, Konstantin B. [1 ,2 ]
机构
[1] Ruhr Univ Bochum, D-44801 Bochum, Germany
[2] LD Landau Theoret Phys Inst, Moscow 119334, Russia
来源
PHYSICAL REVIEW B | 2008年 / 78卷 / 03期
关键词
D O I
10.1103/PhysRevB.78.033404
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Universal conductance fluctuations in graphene samples at energies not very close to the Dirac point are studied analytically. We demonstrate that the conductance variance is very sensitive to the elastic scattering that breaks the valley symmetry. In the absence of such scattering (disorder potential is smooth at atomic scales and trigonal warping is negligible), the variance is four times greater than in conventional metals, which explains a recent unexpected numerical finding. Strong intravalley scattering and/or warping reduces this factor to two and only the intervalley scattering leads to same result as for conventional metals. Different universal values of the variance, when compared with experimental data, can provide important information about disorder in the system.
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页数:4
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