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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Solid lines represent Eq. Such values cannot be attained in semiconductors or non-suspended graphene. Figure 5 Conductivity corresponding to the experimental data of Mayorov et al. Series I Physics Physique Fizika.

Approaching ballistic transport in suspended graphene.

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 transprt liquid helium temperatures. Figure 2 Temperature-dependent electron density n T [Eq.

The dashed line indicates the conductivity due to the Coulomb disorder and the short-range disorder. Figure 4 Conductivity corresponding to the experimental data of Du et al. B 87— Published 18 January Approaching the Dirac point in transport S. Weyl fermions are observed approavhing a solid. Figure 10 Temperature-dependent conductivity of SG corresponding to the experimental data of ab Bolotin et al.

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. 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 studies in high-quality suspended graphene.

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Figure 3 Conductivity of SG corresponding to the experimental data of Bolotin et al. Das Sarma 1 and E. Sign up to receive regular email alerts from Physical Review B.

Solid dashed lines graphen Eq. The same parameters used in Figs. Density-dependent electrical conductivity in suspended graphene: 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.

Approaching ballistic transport in suspended graphene.

At higher temperatures, above K, we observe the onset of thermally induced long-range scattering. Here we show that the fluctuations are significantly reduced ballistif suspended graphene samples and we report low-temperature mobility approachingcm2 V-1 s-1 for carrier densities below 5 x cm Das Sarma and E. 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 studies in high-quality suspended graphene.

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However, when the graphene sample is supported on an insulating substrate, potential fluctuations induce charge puddles that obscure the Dirac point physics.

Solid dashed lines indicate the results with without phonon scattering.

Xu Du – Google Scholar Citations

In d the nonmonotonic behavior at high densities does not appear due to the strong short-range potential scattering, but in high-mobility suspneded b the hraphene behavior shows up due to the much weaker neutral impurity scatterings. We provide detailed numerical results for temperature- and density-dependent conductivity for suspended graphene.

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 disorder as well as between diffusive and ballistic transport may considerably complicate the picture.

Figure 9 Temperature-dependent conductivity of Ballistix corresponding to the experimental data of a Du et al. Figure 6 Calculated conductivity as a function of density for different temperatures: Here n 0 indicates the density induced by the gate voltage and n T indicates the total density, i.

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