Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene

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Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene. / Laitinen, Antti; Paraoanu, G. S.; Oksanen, Mika; Craciun, Monica F.; Russo, Saverio; Sonin, Edouard; Hakonen, Pertti.

In: Physical Review B, Vol. 93, No. 11, 115413, 09.03.2016, p. 1-14.

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Laitinen, Antti ; Paraoanu, G. S. ; Oksanen, Mika ; Craciun, Monica F. ; Russo, Saverio ; Sonin, Edouard ; Hakonen, Pertti. / Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene. In: Physical Review B. 2016 ; Vol. 93, No. 11. pp. 1-14.

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@article{9f8d75d379994c4586b19232940a122f,
title = "Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene",
abstract = "The inherent asymmetry of the electric transport in graphene is attributed to Klein tunneling across barriers defined by pn interfaces between positively and negatively charged regions. By combining conductance and shot noise experiments, we determine the main characteristics of the tunneling barrier (height and slope) in a high-quality suspended sample with Au/Cr/Au contacts. We observe an asymmetric resistance Rodd=100-70Ω across the Dirac point of the suspended graphene at carrier density |nG|=(0.3-4)×1011cm-2, while the Fano factor displays a nonmonotonic asymmetry in the range Fodd∼0.03-0.1. Our findings agree with analytical calculations based on the Dirac equation with a trapezoidal barrier. Comparison between the model and the data yields the barrier height for tunneling, an estimate of the thickness of the pn interface d",
author = "Antti Laitinen and Paraoanu, {G. S.} and Mika Oksanen and Craciun, {Monica F.} and Saverio Russo and Edouard Sonin and Pertti Hakonen",
year = "2016",
month = "3",
day = "9",
doi = "10.1103/PhysRevB.93.115413",
language = "English",
volume = "93",
pages = "1--14",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "11",

}

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TY - JOUR

T1 - Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene

AU - Laitinen, Antti

AU - Paraoanu, G. S.

AU - Oksanen, Mika

AU - Craciun, Monica F.

AU - Russo, Saverio

AU - Sonin, Edouard

AU - Hakonen, Pertti

PY - 2016/3/9

Y1 - 2016/3/9

N2 - The inherent asymmetry of the electric transport in graphene is attributed to Klein tunneling across barriers defined by pn interfaces between positively and negatively charged regions. By combining conductance and shot noise experiments, we determine the main characteristics of the tunneling barrier (height and slope) in a high-quality suspended sample with Au/Cr/Au contacts. We observe an asymmetric resistance Rodd=100-70Ω across the Dirac point of the suspended graphene at carrier density |nG|=(0.3-4)×1011cm-2, while the Fano factor displays a nonmonotonic asymmetry in the range Fodd∼0.03-0.1. Our findings agree with analytical calculations based on the Dirac equation with a trapezoidal barrier. Comparison between the model and the data yields the barrier height for tunneling, an estimate of the thickness of the pn interface d

AB - The inherent asymmetry of the electric transport in graphene is attributed to Klein tunneling across barriers defined by pn interfaces between positively and negatively charged regions. By combining conductance and shot noise experiments, we determine the main characteristics of the tunneling barrier (height and slope) in a high-quality suspended sample with Au/Cr/Au contacts. We observe an asymmetric resistance Rodd=100-70Ω across the Dirac point of the suspended graphene at carrier density |nG|=(0.3-4)×1011cm-2, while the Fano factor displays a nonmonotonic asymmetry in the range Fodd∼0.03-0.1. Our findings agree with analytical calculations based on the Dirac equation with a trapezoidal barrier. Comparison between the model and the data yields the barrier height for tunneling, an estimate of the thickness of the pn interface d

UR - http://www.scopus.com/inward/record.url?scp=84960863380&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.93.115413

DO - 10.1103/PhysRevB.93.115413

M3 - Article

VL - 93

SP - 1

EP - 14

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 11

M1 - 115413

ER -

ID: 1930895