The specific problem is: article was merged and the lede needs to be reviewed for duplicate material Please help improve this article if you can. March In mesoscopic physics , ballistic conduction ballistic transport is the transport of charge carriers usually electrons in a medium, having negligible electrical resistivity caused by scattering. For a given particle, a mean free path can be described as being the average length that the electron can travel freely, i. The mean free path can be increased by reducing the number of impurities in a crystal or by lowering its temperature.
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Douzragore Electrons have several properties: Electrons which undergo inelastic interaction are then similar to non-monochromatic light.
Consider a coherent source of electrons connected to a conductor. For the 1D graphene nanoribbon field formzlism transistor GNR-FET on the right where the channel is assumed to be ballisticthe current from A to B, given by the Boltzmann transport equationis.
Normally, transport of electrons or holes is dominated by scattering events, which relax the carrier momentum in an effort to bring the conducting material to equilibrium. Ballistic transport is coherent in wave mechanics terms. Heat conduction can experience ballistic buttkker transport when heating size is larger than phonon mean free paths. Articles needing cleanup from March All pages needing cleanup Cleanup tagged articles with a reason field from March Wikipedia pages needing cleanup from March All articles with unsourced statements Articles with unsourced statements from July Articles with unsourced statements from June Articles with unsourced statements from February Some kinds of scattering can only cause a change in electron direction, others can cause energy loss.
Non-ballistic electrons behave like light diffused in milk or reflected off a white wall or a piece of paper. The specific problem is: Since the contacts and the GNR channel are connected by leads, the transmission probability is smaller at contacts A and B. See List of thermal conductivities.
There are also other scattering mechanisms which apply to different carriers that are not considered here e. Electrons can be scattered several ways in a conductor. You still can deterministically predict its behavior and use it for computation theoretically.
Ballistic thermal transport has been observed in multiple materials systems . Nanoelectronics Charge carriers Mesoscopic physics. Thus, ballistic transport in a material is determined by how ballistically conductive that material is. Ballistic conduction Ballistic electrons behave like light in a waveguide or a high-quality optical assembly. Views Read Edit View history. Ballistic conduction is the unimpeded flow of charge, or energy-carrying particles, over relatively long distances in a material.
In mesoscopic physicsBallistic conduction ballistic transport is the transport of charge carriers in a medium usually electronshaving negligible fprmalism resistivity caused by scattering. A comparison with light provides an analogy between ballistic and non-ballistic conduction. Information about the state of the electrons at the input is then lost. Electronic Transport in Mesoscopic Systems.
Different materials have different scattering probabilities which cause different incoherence rates stochasticity. Ballistic transport is observed when the mean free path of the electron is much longer than the dimension of the medium through which the lxndauer travels. For a given particle, a mean free path can be described as being the average length that the electron can travel freely, i.
Ballistic conduction is not limited to electrons or holes but can also apply to phonons. Such a transport regime buttiiker been found to depend on the nanoribbon edge formmalism and the electron energy. The contacts have a multiplicity of modes due to their larger size in comparison to the channel. Ballistic conduction enables use of quantum mechanical properties of electron wave functions.
From Wikipedia, the free encyclopedia. As mentioned, nanostructures such as carbon nanotubes or graphene nanoribbons are often considered ballistic, but these devices only very closely resemble ballistic conduction.
In terms of scattering mechanisms, optical phonon emission normally dominates, depending on the material and transport conditions. The dominant scattering mechanism at room temperature is that of electrons emitting optical phonons. When the radius of a contact spot is larger than the mean free path of electrons, the contact resistance can be treated classically. TOP Related.
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