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APPROACHING BALLISTIC TRANSPORT IN SUSPENDED GRAPHENE PDF

Approaching ballistic transport in suspended graphene. Article (PDF Available) in Nature Nanotechnology 3(8) · September with. Here we show that the fluctuations are significantly reduced in suspended graphene samples and we report low-temperature mobility approaching cm2. Transport in Suspended Monolayer and Bilayer Graphene Under Strain: A New. Platform for Material .. Approaching ballistic transport in suspended graphene.

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Approaching the Dirac point in transport S. Weyl fermions are observed in a solid. Density-dependent electrical conductivity in suspended graphene: We provide ballisfic numerical results for temperature- and density-dependent conductivity for suspended graphene. Das Sarma and E. At higher temperatures, above K, we observe the onset of thermally induced long-range scattering.

Here n 0 indicates the density induced by the gate voltage and n T indicates the total density, i. Such values cannot be attained in semiconductors or non-suspended graphene. Solid dashed lines indicate teansport results with without phonon scattering.

The dashed line indicates the conductivity due to the Coulomb disorder and the short-range disorder.

Xu Du – Google Scholar Citations

Unlike two-dimensional electron layers in semiconductors, where the charge carriers become immobile at low densities, the carrier mobility in graphene can remain high, even when their density vanishes at the Dirac point.

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The discovery of graphene raises the prospect of a new class of nanoelectronic devices based on the extraordinary physical properties of this one-atom-thick layer of carbon.

The same parameters used in Figs. Abstract We theoretically consider, comparing with the existing experimental literature, the electrical conductivity of gated monolayer graphene as a function of carrier density, temperature, and disorder in order to assess the prospects of accessing the Dirac point using transport transpport in high-quality suspended graphene.

Approaching ballistic transport in suspended graphene.

Das Sarma 1 and E. B 87— Published 18 January Figure 10 Temperature-dependent conductivity of SG corresponding to the experimental data of ab Bolotin et al. Figure 4 Conductivity corresponding to the experimental data of Du et al.

Sign up to receive regular email alerts from Physical Review B. Here we show that the fluctuations are significantly reduced in suspended graphene samples and we report low-temperature mobility approachingcm2 V-1 s-1 for carrier densities below 5 x cm Figure 9 Temperature-dependent conductivity of SG corresponding to the experimental data of a Du et al.

Solid lines represent Eq. Figure 2 Temperature-dependent baloistic density n T [Eq. However, when the graphene sample is supported on an insulating substrate, potential fluctuations induce charge puddles that obscure the Dirac point physics.

Series I Physics Physique Fizika. In d the nonmonotonic behavior at high densities does not appear due hransport the strong short-range potential scattering, but in high-mobility samples b the nonmonotonic behavior shows up due to the much weaker neutral impurity trandport.

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Moreover, unlike graphene samples supported by a substrate, the conductivity of suspended graphene at the Dirac point is strongly dependent on temperature and approaches ballistic values at liquid helium temperatures.

Solid dashed lines indicate Eq. Figure 3 Conductivity of SG corresponding to the experimental data of Bolotin et al.

Approaching ballistic transport in suspended graphene.

Figure 6 Calculated conductivity as a function of density for different temperatures: We theoretically consider, comparing with the existing experimental literature, the electrical conductivity of gated monolayer graphene as a function of carrier density, temperature, and disorder in order to assess the prospects of accessing the Dirac point using graphhene studies in high-quality suspended graphene. Figure 5 Conductivity corresponding to the experimental data of Mayorov et al.

We show that the temperature dependence of graphene conductivity around the charge neutrality point provides information about how closely the system can approach the Dirac point, although competition between long-range and short-range ba,listic as well as between diffusive and ballistic transport may considerably complicate the picture.