https://www.sciencedirect.com/science/article/pii/S2542529317300597Read at your leisure (but I know the trolls won't!)
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1.3.1. Klein paradox and chiral tunneling
According to the quantum mechanics, regardless of whether the particle energy is higher than the barrier, there is a certain probability through the barrier, while the particles also have a certain probability pass barrier. However, the electrons in graphene are tunneled through the barrier at a probability of 100%. During this phenomenon, the electrons of graphene exhibit the properties of massless particles and are not bounced or reflected because of the presence of the barrier"
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1.3.2. Ballistic transport
The electrons in graphene hardly encounter scattering during transport. Because the electrons in graphene can move like particles of zero mass, the electrons propagate at a rate faster than any known conductor at room temperature. The electrons in graphene do not scattering, due to lattice defects or extraneous electrons when moving in orbit; therefore, the average free path of electrons in graphene can reach 1 μm, and the average free path of electrons in the general material is in the nanometer range [32,33]. Fig. 5 shows the ballistic transport of graphene."
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1.3. Electronic property of graphene
There are three σ bonds in each lattice of graphene. The p orbitals of all carbon atoms are perpendicular to the hybridization plane of sp2 and form a delocalized π bond in a shoulder-by-side fashion, which runs through the whole graphene [11–14]. π electrons are free to move in the plane; therefore, graphene has a good conductivity, thus, at room temperature, it exhibits semi-integer quantum Hall effect, bipolar electric field effect, superconductivity,"