Charge transport in ballistic multiprobe graphene structures

被引：8

作者：

Laakso, M. A. ^{[1
]}

Heikkila, T. T. ^{[1
]}

机构：

[1] Helsinki Univ Technol, Low Temp Lab, FIN-02015 Helsinki, Finland

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 20期

基金：

芬兰科学院;

关键词：

D O I：

10.1103/PhysRevB.78.205420

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the transport properties of multiterminal ballistic graphene samples concentrating on the conductance matrix, fluctuations, and cross correlations. Far away from the Dirac point, the current is carried mostly by propagating modes and the results can be explained with the conventional semiclassical picture familiar from ray optics, where electrons propagate along a single direction before scattering or reaching the terminals. However, close to the Dirac point the transport is due to evanescent modes which do not have to follow a rectilinear path. As we show in this paper, this property of the evanescent modes influences the conductance matrix. However, at best it can be observed by measuring the cross correlations in an exchange Hanbury Brown-Twiss experiment.

引用

页数：5

共 14 条

[1] Colloquium: Andreev reflection and Klein tunneling in graphene [J].

Beenakker, C. W. J. .

REVIEWS OF MODERN PHYSICS, 2008, 80 (04) :1337-1354

[2] Transport through normal-metal-graphene contacts [J].

Blanter, Ya. M. ;

Martin, Ivar .

PHYSICAL REVIEW B, 2007, 76 (15)

[3] Shot-noise current-current correlations in multiterminal diffusive conductors [J].

Blanter, YM ;

Buttiker, M .

PHYSICAL REVIEW B, 1997, 56 (04) :2127-2136

[4] Shot noise in mesoscopic conductors [J].

Blanter, YM ;

Büttiker, M .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2000, 336 (1-2) :1-166

[5] Electronic states of graphene nanoribbons studied with the Dirac equation [J].

Brey, L ;

Fertig, HA .

PHYSICAL REVIEW B, 2006, 73 (23)

[6] SCATTERING-THEORY OF CURRENT AND INTENSITY NOISE CORRELATIONS IN CONDUCTORS AND WAVE GUIDES [J].

BUTTIKER, M .

PHYSICAL REVIEW B, 1992, 46 (19) :12485-12507

[7] THE QUANTUM PHASE OF FLUX CORRELATIONS IN WAVE-GUIDES [J].

BUTTIKER, M .

PHYSICA B, 1991, 175 (1-3) :199-212

[8] Shot noise in ballistic graphene [J].

Danneau, R. ;

Wu, F. ;

Craciun, M. F. ;

Russo, S. ;

Tomi, M. Y. ;

Salmilehto, J. ;

Morpurgo, A. F. ;

Hakonen, P. J. .

PHYSICAL REVIEW LETTERS, 2008, 100 (19)

[9] RELATION BETWEEN CONDUCTIVITY AND TRANSMISSION MATRIX [J].

FISHER, DS ;

LEE, PA .

PHYSICAL REVIEW B, 1981, 23 (12) :6851-6854

[10] Energy band-gap engineering of graphene nanoribbons [J].

Han, Melinda Y. ;

Oezyilmaz, Barbaros ;

Zhang, Yuanbo ;

Kim, Philip .

PHYSICAL REVIEW LETTERS, 2007, 98 (20)

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